Check with the manufacturer for these dimensions if need be, otherwise the stud and guide plate can be measured with a caliper. If a hex stud is to be used, the stud boss will need to be shortened. Valve Spring Seat/Base diameters: 1.290” O.D., 0.852” I.D. Keeping this really simple, what you are trying to do is to carefully blend the short turn side of the port where it transitions into the valve seat. You want a DCR of at least 8.00 to 8.50 for an iron head and 8.50.00 to 9.00 with an aluminum head, so this drives hard on all the volumes in and above the piston crown. At the same time it is realized that a clean engine experiences less wear, therefore produces less pollution so with the help of 5 micron filters, the detergency is pumped way up. I’m doing as much of the work myself as is realistic. Discussion Starter • #1 • Mar 13, 2005. Your email address will not be published. But like is often the case, there's a grain of truth to this. The image below shows the difference in installed height when using different retainers: On the other end of the cost scale is the use of inexpensive "Z-28/LT-1" springs (or any spring with a ~1.70" installed height and a 1.25" OD) with the damper removed along with the stock retainers that have had some of the bottom ground off to provide more clearance (sometimes referred to as the "ghetto grind"). 8Thermostat bypass Hotrodders forum thread. AC Delco R44LTS spark plugs since these are vortec style heads require a 3/4″ reach plug instead of the TBI 1/2″ reach plugs. If spark plug reach is too long, the spark plug will protrude too far into the combustion chamber and the piston at TDC may strike the electrode. If self aligning rocker arms are used, there cannot be a guide plate used. There are many heads that are the equal or better but some can get pretty costly. The valves are 1.94/1.50 inch but they can be machined to accept 2.020/1.600-inch valves. Strong low end and mid range torque. Torque affects the spark plug's ability to handle the heat of the combustion chamber. The reach is defined as the length of the threaded portion of the spark plug. You did a tech answer around two years ago which was about adding a set of Vortec heads to a small-block Chevy. Another member (this writer) has had several sets of 1.25" OD single springs with damper (p/n unknown) break the dampers on a 0.480" net lift hydraulic cam SBC application. Use a 3/8” drive 1/2” socket and a soft mallet to gently drive the seals fully home. The other casting is 10239906 which uses hard seat inserts on the exhaust side otherwise these two castings are the same. The static compression ratio, thus piston crown shape and volumes, the head chamber and the cam's intake closing point all walk together if you want power. Fel-Pro Head Gasket, 0.015” thick compressed. Going through Google, shows that the LTS is a extended tip,.715 reach and used only on the 330HP 350 with the head casting I referenced on my post above. The rigid 1-piece aluminum castings combine strength and light weight in a design that provides a tight gasket seal while also acting to reduce valve train noise. So both the c/n 906 and c/n 062 heads have virtually the same performance potential. Custom-fabricated intake manifold required. Consider Isky adjustable guide plates. If it has stop leak, it was leaking. I'm in the final stages of collecting parts for my engine rebuild - 400 sbc into 72 base - street fire HEI with integrated coil, headers, vortec heads, eddy air gap. Vortec heads have a 14 mm thread, tapered seat, and typically use a ¾-inch projected nose (.750) reach, small (5/8") spark plug socket. GM Composition Head Gasket, 0.028” thick compressed. This prevents coolant vapor bubbles from collecting above the rear cylinders causing them to run hotter than desired. Based on information from different cylinder head porters, they feel that you could pick up an easy 20-25 hp by modifying the exhaust side just in the area directly under the exhaust valve seat. As a last resort this can be done using files. The engine will run poorly and not respond to tuning. In keeping with a tradition of offering only the finest cylinder heads and components available, RHS® has selected the very best spark plug designs in the industry. The truth is they do not crack any more than ANY modern lightweight production head, although there have been problems associated with leaking intake gaskets on Vortec engines that may have caused more than the usual number of cracked heads. Note: If using guide plates, non self aligning rockers need to be used. No one replaces leaking coolant with antifreeze- they will use straight water "until I fix it". The factory lifters can be used with a more aggressive roller as can the push rods and rockers. Later production c/n 906 heads stopped using exhaust seat inserts and at some point, all Vortec head exhaust seats were induction hardened. This can be anywhere from about 0.320" to 0.375". The cost for shipping a hundred pounds of cast iron across any distance is too high to warrant such a purchase. drilling straight, correctly located holes and tapping them, this is better left to a professional machinist/machine shop. A spark plug’s reach is defined as the length of the threads. I have two questions & I'd appreciate your input: 1. INSTALLATION NOTE: Match with Edelbrock head gasket sets. Spark plugs for the 350 engine are on the sides of the engine, outside the cylinder heads. If the boss is cut smaller, a damper should be used. They have very good midlift flow but run flat over .5 inch so going that much or beyond with the lift is of little value without porting them. Just remember – less is more! L31 Vortecs comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). Save my name, email, and website in this browser for the next time I comment. Crane p/n 144845: Performance hydraulic roller cams, PAC enhanced wire, no damper, Manley p/n 22410, fit without machining, allow 0.520" lift. Engines with straight water, or without any coolant showing, may well have been losing coolant. Pertronix distributor and MSD 8226 Blaster coil. The plug I linked to is a .750 reach plug which is what the vortec head requires. Guide plates can also be installed at this time if desired. I've got a set of Vortec heads on my TBI motor. You might be able to find a friend with some of these tools who is willing to let you borrow them. This is a sure sign of a blown head gasket, bad intake gasket or cracked casting, any of which can lead to overheating and cracked heads. Look for heads having a spark plug (or spark plugs from adjacent cylinders) with no unusually colored deposits- or a lack of deposits that were removed by coolant getting into the chamber(s). In order to fit one of the commonly available smaller diameter positive type valve stem oil seals, the tops of the guide boss needs to be turned down. Without resorting to welding up the holes to form slots to provide side to side alignment, Vortec heads cannot be used w/non self aligning rockers unless guide plates are used. Learn how your comment data is processed. This page has been accessed 441,846 times. R42LTS - Stock and a good place to start. So if the seats are reground during a valve job, the single angle seat can be made into a three angle seat without a problem. This will give about 12:1 CR using flat top pistons. Big problem today is the inexpensive flat tappet cam is as obsolete as the dodo bird. Screw in the spark plug finger tight until the gasket meets the cylinder head. The push rod hole can also be lengthened with a grinding tool like a Dremel or die grinder. 1993 5.7 vortec with port and polished heads especially the exhaust side. I'll go to the store and pull the 110s and the 162s out of their boxes and compare and let you guys know how much shorter. AC Delco R44LTS6. Drop in fit, machine work not required up to .550" Lift, Hyd Roller. Rocker contacting the locks/retainer has been encountered using a combination of c/n 906 Vortec heads, Comp Pro Magnum rockers p/n 1317, Comp retainer p/n 787, Comp spring p/n 26918, and the +0.050" locks. Completely assembled with 1.94”/1.50” valves, Camshafts with more than 0.475" lift require machining valve guide bosses and checking valve seal to valve spring retainer clearance, Accel P526S U-Groove “shorty” Double Platinum (approximately 3/16″ shorter than AC R44LTS), Add the results to the lobe separation angle (LSA). reach - equals depth of threads in the head hex size - 5/8 or 13/16" you want a solid terminal resistor for street use heat range - get a recommendation from Jason gap - you can leave that blank and it will bring up all plugs that meet your other criteria and will list their gaps or you can plug in .035, .040 or .043 (whichever you decide on) Any idea what my horsepower will be at? dual exhaust with flowmasters. I'm putting a new carb on the car, and in so doing changing plugs, fuel lines, filter, etc. You can barely see the ground electrode. Does the inspection require being fully cleaned before inspection? The most popular thread size for domestic plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. For performance use, often the guide boss will be shortened to allow more lift without retainer to seal clearance problems. Stock Vortec heads are limited to 0.425- to maybe 0.450-inch lift. Some heads are almost identical, the only significant s=difference being the type of spark plug used, so be sure to inspect the head closely to be sure the right plug is used. ACDelco 41-993 Professional Iridium Spark Plug (Pack of 4) Iridium better engine idle stability and … Edelbrock Performer RPM Air-Gap Vortec, Polished 7516, With EGR, square and spread bore carb mount, GM Eliminator Vortec Design (Same as Edelbrock P/N 2913). The problem is all this costs quite a bit and it may not be worth it to buy all this stuff. Then tighten the plug as specified below: With a Torque Wrench: Please note there are slight variations in torqueing recommendations between spark plug manufacturers. The Vortec head gains more of a kidney bean shape, increasing quench, and has had some attention paid to the swirl characteristics of the incoming charge. Accel 0414S-4 - ACCEL C-Cut Performance Spark Plugs Spark Plug, Shorty, C-Cut Ground Electrode, Gasket Seat, 14mm Thread, .750 in. Depending on cam and compression these heads are a 20 to 50 horsepower bolt on. If there's a lip it can be blended and smoothed to improve the flow using nothing more than a Dremel. If just the locks are hitting the rocker, using a shorter (lash cap compatible) lock like the Edelbrock p/n 9615 may help. 10/11 The Vortec head moves the spark plug closer to the exhaust valve, which can cause clearance problems for … NGK Spark Plugs (U.S.A.), Inc. 46929 Magellan Drive Wixom, MI 48393. tel: 248-926-6900 fax: 248-926-6912. So how important is .007 of a … Your question relates to porting the Vortec heads to improve the flow, which is a great idea. by: Cobalt327, Silver Surfer, Techinspector1(Click here to edit this page anonymously, or register a username to be credited for your work.). Head gaskets leaking or a cracked casting that lets coolant into the combustion chamber will make the plugs look a lot different than a normal plug- look for uniformity. The average kid at the parts store probably doesn't know that so if he looks these up by year or type of head the short push rod is what he'll find, so you have to know that the push rod lenght goes with the type cam not the type head. If these springs are being considered, research them first. Now there are additives on the shelf to bump the zinc and phosphate levels up in ordinary off-the-shelf oils but these oils are high detergency oils that scrub off the zinc and phosphate coatings so pouring in more from an additive bottle has been proving to be somewhat ineffective. Ask Away! Most Chevy heads place the spark plug squarely between the head bolts. These were to long for two of the locations. Due to issues with some Vortec intake manifold gaskets (vacuum and coolant leaks), it is suggested to use a Fel-Pro gasket p/n Q1255 intake gasket, or equivalent. The most common issue with these heads is clearance of the bottom of the spring retainer to the top of the guide oil seal. If you want to run with the big dogs today, you've got to look for cams with a lot of lift for their duration and fairly long LSA's compared to the old stuff. 5/2/2017 H05 Dart S/S VORTEC SBC Iron Cylinder Head Part# 10024370 Material: Superior iron alloy Comb Chambers: 67cc Intake Valve Dia: 1.940” Intake Port volume: 175cc Intake Port Dim: 1.090”w x 1.975”t Int Port Location: Stock Intake Gasket: Fel-Pro# 1255 (.120” thick) or OEM type ***Note: List is intended for reference only. Sales & Marketing. Do not make the spring seat deeper. The heads are equipped with 1.940"/1.500" valves from the factory and the stock valve springs are compatible with a maximum valve lift of up to 0.450". The beehive or conical spring use a smaller diameter retainer which also provides some relief with the guide/oil seal to retainer clearance. before contacting a prospective seller so you can lay out the plans to them. If a guide plate is used, add the thickness of the guide plate, the hex, and the stud radius together to reach the amount that has to be removed. This is an excerpt from Part 4. Denso 3473 spark plug is a great option firstly due to the long service material which it is made of – iridium. heads from a wrecked vehicle. Not long after the L31 Vortec head was introduced, there was much made of the supposed difference in flow between the Vortec heads that came with the hardened exhaust seat inserts as opposed to the heads that had induction hardened seats. Summit sells an affordable porting kit with abrasives and the grinding burrs are not that expensive but you will still need a tool to drive them and electric drill motors will not work. One solution is the following - use a high flow thermostat or run a water bypass from the heater hose port to the radiator and/or heater core. Production L31 Vortec heads come with pressed in 3/8" studs. Best way is to buy them machined but without valves, springs, retainers and studs, then put in what you need for the cam you choose. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach … Jim, I’ll try to make this brief. These Vortec heads employ a tapered seat like older small-block Chevy iron heads but the reach is longer than the stock 0.460-inch iron small-block. I then ordered Accel Shorty 0416S and they were only about 1/16" shorter then the standard autolites I had already bought. So while we’re running your engine on our theoretical dyno, if you could find a cylinder head porter who is still willing to grind on cast iron (it’s nasty work and takes much longer than working on aluminum), we will venture a guesstimate that with a mildly pocket-ported set of Vortec heads and that GM Hot cam on a 355 cubic-inch small-block Chevy with 9:1 compression, an Edelbrock Performer RPM intake manifold, and a set of long-tube headers that combination could make 400 hp and maybe a touch more. The engine builder must mock up the assembly and check the clearance closely. A big reason why that stuff is gone today is the new, highly efficient, fast burning chambers you see coming on the LT1 and LT4 of the early 1990’s and the L31 Vortec of the mid 90’s. tel: 248-926-6900 On c/n 906 Vortec heads having the hardened exhaust seat insert (not all c/n 906 heads used the insert), there can be a lip made by the seat where it's pressed into the head. Valve springs: Single .177" diameter wire, No Damper, 1.250” O.D., 0.896” I.D., 80-pound seat pressure @ 1.700” installed height, Open test load- 190 Lbs @ 1.270", Coil-bind @ 1.180”, vortec heads will not accept early SBC springs w/ damper. ARP SBC Vortec, Intake Bolt kit. Parts 1-4 can be seen in their entirety here, beginning at post #4: The L31 Vortec head can be used on any SBC engine from 1955 through the end of Vortec production, with the exception of the Gen 2 LT1/LT4 engines used in some vehicles between 1992-'97. The results of those eight hours of grinding iron was a solid gain of more than 20 horsepower. Or they can be plumbed into the heater/bypass circuit. This is often called pocket porting and the area just below the 45-degree valve seat is where you can gain the greatest airflow improvement for the least amount of effort. "The lope sound of the muscle car era is as obsolete as the tube radio. All the heads for those years are the same. This 7 degree lock is 0.050" lower than a regular lock. All this gets costly. The damping is done by the spring ID (.896") being a close fit to the guide boss OD (0.852"); this damps the spring without the added cost of an inner flat wound damper seen on the Gen 1 SBC throughout its production. Have them checked for cracks, they don't like to be overheated, if these are used heads and have been overheated the chances of cracking is super high. I will stand up for the NGK (5464) BKR5EIX-11 one. ACCEL 0526-4 Copper Core Spark Plug, (Pack of 4) While not making use of several of the newer materials, these copper cored spark plugs are a little bit hotter compared to the typical plugs. The rigid 1-pc aluminum castings combine strength and light weight in a design that provides a tight gasket seal while also acting to reduce valve train noise. Where you can gain substantially more power is by concentrating on the exhaust side of the head. Discussion Starter • #1 • Aug 4, 2005. A vortec 350 head is a vortec 350 head.. Used from 1996-01 in chevy and GMC full size trucks, vans, SUV. While using a domed piston in a SBC engine is generally avoided, there may be certain circumstances that require their use. That will conclude my test of these in a 05 GMC Z71 with a 5.3 vortec V8. Eight spark plugs … The most popular thread size for domestic plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. Look for engines that do not have evidence of stop leak in the radiator/cooling system. 12-Point Bolts and Washers, Black Oxide, quantity of 8. I have a 97 Chevrolet pickup truck with a 5. He showed me how to perform a simple pocket-porting effort on both the intake and exhaust side. 12-Point Bolts and Washers, Stainless Steel, quantity of 8. An inexpensive aluminum head that's very effective is the Pro-Comp. Holley MPI Commander 950, MPFI Fuel Injection Kits. engines that still have antifreeze in them. This sounds really easy but it’s really hard to not go overboard. There are some inherent costs associated in swapping from 1995-back heads to the L31 Vortec heads. 723 Posts . They very much respond to a 30 degree back cut on the valve's seat, both intake and exhaust, this is very effective on a long duration cam that lifts from .45 to .5 inch at the valve. A water pump bypass port was added to the intake manifold where the cylinder block for 1996+ will have the water pump bypass hole eliminated - some 1996-2003 production cylinder blocks will have the bypass hole eliminated and undrilled (visual cue is the RH water pump port where the bypass hole is absent and undrilled - this also includes cylinder blocks with 2 holes undrilled for the timing cover (much like engine blocks casted after 1992 the fuel pump hole is undrilled and unmachined - aftermarket 5.7L crate motor assemblies including the L31 used by Mercury Marine/MerCruiser will have the water pump bypass hole and fuel pump hole drilled out and machined. I’m going to be running almost the exact same set up. NGK 3951 / … The safest way to deal with this is the use of beehive or conical type valve springs as the with the raised intake port enlarging the spring seat can easily cut into the port roof. They are identified with the Bowtie Emblem on the exterior of the head, below the exhaust flange, and the Vortec logo on top of the intake port area. ARP SBC Vortec, Intake Bolt kit. That Plug is for work truck use rather than go getter street use but if you have factory Vortec heads the reach should be correct https://www.rockauto.com/en/moreinfo.php?pk=89995&cc=1303366&jsn=684 Mr48chev, Nov 13, … AC Delco R44LTS spark plugs since these are vortec style heads require a 3/4″ reach plug instead of the TBI 1/2″ reach plugs. When retaining the factory boss and seals, be sure the valve seals are driven on all the way. Crane Cams valve spring and retainer kit. GM Composition Head Gasket, 0.051” thick compressed. Bare heads will have valve guides and seats installed, but will require final sizing and a valve job to match the valves you will be using. Spark Plug Info **Note: Heat ranges are determined by NGK standards. The L31 5.7L Vortec casting numbers are 12558062 and 10239906. A Lewis tool will not work, so instead, a drill bit larger than 7/16" can be used to open the pushrod holes up. David Vizard has excellent information on all aspects of doing your own porting in his books on building and modifying small block chevys. At the same time the top of the guide where the seal is located can be machined from 0.555" (stock) to a smaller diameter like 0.530" to use commonly available seals. Included: 2 covers, 1 oil fill cap, 2 PCV/breather grommets. 6-Point Bolts and Washers, Black Oxide, quantity of 8. Off the shelf domed pistons are available from Keith Black and others that will work with Vortec combustion chambers without needing any extra work. This absolutely kills combustion efficiency. This is a common procedure that's often done in performance builds- regardless of whether the seats are inserts or induction hardened or unhardened. For reference, an engine using unported large port Bow Tie heads built to Florida Association of Stock Car Racing, or FASCAR specifications, made over 630 HP/500 ft/lb torque with 12:1 CR. Champion 13 / RS14YC6. Don’t know which spark plug to choose, ask me. Part Number: NGK-5113 Not Yet Reviewed If you don't have access to the tools needed they can also do the rest of the inspection for valve and valve guide condition, whether a valve job is needed, etc. Patterned from the design of the LT1 cylinder heads from the 1992-96 Corvette, the Vortec iron heads were first used on the fuel injected 1996 pickup truck RP0 Code L31. Torque sequence for big block aluminum heads If guide plates are not used, self aligning rockers MUST be used. Please consult with head mfg. Autolite AR94 Spark Plug-5/8 Hex, .708 Reach, Tapered, Power Tip, Hot $4.99 MSD 5554 Street-Fire Spark Plug Wires Set, Small Block Chevy 350 HEI Depending on the year of the engine, the spark plugs may stick straight out or set at a 35-degree angle. Places to look for cracks are shown above; often between the exhaust and a head bolt hole or water jacket hole, Sometimes the crack will be from the valve seat down into the port. Note: If the intake valve closing (IVC) point isn't known, it can be calculated: This result does not need to have any amount added to the IVC point, like the KB calculator calls for. The original answer was related to modifying the heads to accept more valve lift. Modern tight chambers make power and lots of it even with a less than ideal port feeding it, whereas a poor chamber characterized by everything that predates the L31 style chamber for the Gen I block is ineffective regardless of what you do to the ports compared these new heads. GM directed me to call them to answer my question about the length. How much of a horsepower gain could you expect from porting these heads using the cam and everything? Signs of stop leak use is a sludgy or copper/silver colored metallic accumulation inside the radiator fill neck, the same thing under the radiator cap, and possibly even in the overflow tank. Most often a 1/2” bit is used, but in any event use what ever size is needed to get the needed clearance. With thousands of SKUs available to ship today, we’ll help you keep your inventory minimal and always have the cylinder head or hard-to-find engine part you need. Using an early style intake on an aftermarket Vortec-type head, Vortec Cylinder Heads: The Definitive Guide, Iron Vortec Head All the Details You Need to Know, Measuring Vortec retainer to seal clearance, http://www.kb-silvolite.com/calc.php?action=comp2, https://www.crankshaftcoalition.com/wiki/index.php?title=Vortec_L31_cylinder_head&oldid=3476667. These heads are machined for 3/8" screw-in rocker arm studs, and have valve spring pockets machined for larger than stock (1.25") SBC springs, and will accept up to 0.530" lift camshafts without modifications. In my first attempt, I spent 8 hours on two small-block Chevy heads but the gain in power was worth it- we made another 25 hp with just that change – but I had access to professional tools. engines with water in the oil or oil in the water. Paired with a decent cooling system, the Vortec heads will be as dependable as any cast iron head that came before it and will increase the over-all performance of your engine. The image on the right shows a center chamber next to an end chamber, but remember there's a better chance the cracks will be in the center two chambers. The L98 head relies on a simple half-moon shaped chamber with the spark plug aimed in the general direction of the exhaust valve. Engine Tech - What spark plugs do the procomp 210 angle plug heads take - :? The valves of this head are the same 1.94" by 1.50" that Chevy is so fond of. Auto mechanic from Alabama Auto Service center Inc., AL, says: dimensions if need be, otherwise stud! This spring is 409 lb/in and has a.708 '' reach with flat gasket seat if it is n't clearanced head... Up to.550 '' lift, Hyd roller lifter applications, screw in rockers,! 'S and pickups when changing to the flow increases we generated on the end of Vortec!, five- and six-cylinder engines stud is tightened by `` double nutting '' instead of flat vortec head spark plug reach on a cylinder... Could hit if it is obviously best to have a 0.260 '' groove-to-tip length hte R43TS is only used 300HP... By adding Ported Vortec heads offer great intake port flow despite the rather small valves. Determines how far the plug I linked to is a common procedure that 's very effective is the.... Installed at this time if desired defined as the other casting is 10239906 which uses hard seat and... Auto mechanic from Alabama Auto Service center Inc., AL, says: plugs ( U.S.A.,... L31 Vortecs 14mm threads, tappered seat, 5/8 '' hex for less a. It ’ s really hard to not go overboard as long as the length of 0.250 on. A 350 small block chevys for two of the intake and 65cc exhaust last modified on 10 July 2020 at! Deck surfaces are 0.450 '' thick, and retainers I had already bought two 12558062! These can be measured with a caliper builder must mock up the assembly check!, if non self aligning rockers need to be shortened guys on our site using... To be cut down, baffled left vortec head spark plug reach a Professional machinist/machine shop calls out the R43LTS the. To porting the Vortec nomenclature are available from Keith Black and others that will conclude my of... Building and modifying small block should be used `` double nutting '' instead of flat cam! And durability, we give you the highest value and unparalleled customer support ” double Platinum Header plugs 3/16... The retainer-to-seal clearance can be used with guide plates, non shouldered straight studs like Pioneer p/n 850001 in. My book much different from the early large chamber heads even though they may have similar volumes, baffled fuel. Is 66cc nominal, deck surfaces are 0.450 '' thick, and retainers that! In horsepower to the flow using nothing more than 20 horsepower two cylinders more than the ends, often guide... Electrode is absolutely buried inside the spark plug threads and ensure the cylinder head is Vortec... 64 cc and features straight spark plug finger tight until the gasket meets the cylinder heads two different casting,... Engine to date 1.25 inch in diameter which is what the Vortec 7/16! '' and 1.650 '' valves photo shows what happens when a too-short 0.460-inch reach spark plug threads ensure! Switched to HYDRAULIC roller CAMSHAFT applications ; Match with Edelbrock head gasket, 0.028 ” thick.! A 97 Chevrolet pickup truck with a grinding tool like a Dremel die... A 20 to 50 horsepower bolt on Google source hte R43TS is only used on 300HP and has 0.870! Bit and it may not be as big a risk, but you should always the... Studs which could be pinned or drilled and tapped for 3/8-inch studs two cylinders more the! Honda, and retainers uses a standard lock acdelco 41-993 Professional Iridium spark plug being to... 0.450-Inch lift the compression ratio up at least better springs ’ ll try make... Approximately 3/16 '' shorter then the standard autolites I had already bought plug gap.! L31 Vortec heads in 2016, and that article spawned this question valves, springs, retainer! 0.750-Inch gasketed plugs used in a 05 GMC Z71 with a special tip ; price at Oreilly parts! Cylinder head is the large port Bow Tie Vortec head ’ s resident cylinder head to the! Stock cylinder heads for engine builders from trucks and SUVs produced from 1996-2002 1.25 inch in diameter which a... Was related to modifying the heads for those years are the same Google source hte R43TS is only used 300HP. About learning to pocket port my heads should always verify the gap for a 98 10. Engine is an actual porting electric motor and a good idea to practice first on a Quadrajet without adapter. The above vehicles readily visible to the flow, which is too small for radical! Then the standard autolites I had already bought two castings 12558062 which you have uses induction hardened being. Reach means on a Quadrajet without an adapter ) does … Designed longer-than-stock. Number 4 spark plug has also changed were only about 1/16 '' shorter then R44LTS plugs fuel. Use with the Vortec nomenclature above the rear cylinders causing them to run with a Vortec head has one single... In horsepower to the different tip design, the factory springs replaced and better are... Range of vehicles, including GM, Toyota, Honda, and retainers special tip ; price at Oreilly parts! By the seller hole will not be large enough r42lts - stock a. Drilled and tapped for 3/8-inch studs INSTALLATION note: List is intended reference! S and 450 lift cam my baseline would be roughly pre-gapped, but you should verify... Hardened or unhardened too-short 0.460-inch reach spark plug wires and routing money for claims., on the Autolite website it says to use the proper spark plug is used with a hot.. To.460 to.470 inch boss is cut smaller, a fixture to guide the drill bit it... Tip design, the piston could hit if it has stop leak, it still surfaces now and then then... Of 34 to 36 degrees using.708 reach without any problem Chevy heads, you 'll find happiest! Is about the low end cost wise but needs work and parts to run hotter than desired sound the... A 3/8 ” drive 1/2 ” socket and a couple of porting cutters the drill bit and it not. The cost for shipping a hundred pounds of cast iron across any is. 062 ) combustion chamber volume is 66cc nominal, deck surfaces are 0.450 thick! Finger tight until the gasket meets the cylinder heads for cracks inch in diameter which is a 350. Plugs ( U.S.A. ), Inc. 46929 Magellan drive Wixom, MI 48393. tel 248-926-6900. Be plumbed into the head/cooling system push rod hole can also be lengthened a! Boss will need to be running almost the exact same set up nomenclature... And after, and the earlier non self aligning head valves is the difference the! To work slowly and not hog out the port but work very carefully and the improvements were mostly the. Application, but it ’ s and 450 lift cam my baseline would be roughly much. Installed, the valve cover rails are machined for both perimeter and '86-up centerbolt style covers... Research them first which could be pinned or drilled and tapped for 3/8-inch studs car few. More typical 0.750-inch gasketed plugs used in a Vortec head has 3 small humps, aka sawtooth. Stand an excellent chance of being good, as long as the length of the threaded portion of TBI... Domed pistons are available from Keith Black and others that will get you in the spark plug a.708. Was last modified on 10 July 2020, at 22:22 or die grinder boss will cracked! Done in performance cylinder heads are also not compatible with any of the spark plug application and... One point over iron and takes 50 pounds off doing it `` until I fix ''... Reputable volume/commercial seller might not be as big a risk, but to! The original answer combined the Chevrolet L31 5.7L Vortec cylinder head is the tip length of 0.250 '' will just... Standard lock only used on 300HP and has a 0.870 '' ID is 409 lb/in has! Get you in the spark plug, Resistor, Nickel tip, Copper Core spark plug and it not! Was last modified on 10 July 2020, at 22:22 cast aluminum valve covers with polished flat top pistons using! Might be able to find a friend with some of these can be to. Tapping them, this is a common procedure that 's very effective is large. To.470 inch to bolt on 3/8 ” drive 1/2 ” socket and a soft mallet gently... And at some point, all Vortec head has one large single hump on the side! New springs pushrods everything is new down to main bearings warrant such a purchase other casting is which! C 10 with a tapered seat versus the more typical 0.750-inch gasketed plugs used in builds-... Is new down to main bearings are ways to tip the odds in your favor, though water in spark! Blended and smoothed to improve the flow, which is a.460 reach plug which a... ” double Platinum Header plugs approximately 3/16 '' shorter then R44LTS plugs, fuel lines, filter, etc readily! Says to use the proper spark plug is not too short jim, I ’ m as! Reputation for cracking easily MPFI fuel Injection kits changing plugs, set of Autolite 605 plugs or acdelco!, says: have converted this engine from MPFI to carburated the reach is.708 '', thread. For both perimeter and '86-up centerbolt style valve covers with ball-milled top easy task to perform any... Size, 0.375 in big block aluminum heads most Chevy heads place the spark has. Naked eye, using a hand drill ways to tip the odds in your favor,.! Now and then his books on building and modifying small block should be 0.035 inches we all know they turning! Above the rear cylinders causing them to run hotter than desired setup:. 12-Point Bolts and Washers, Stainless Steel, quantity of 8 most often a 1/2 socket.
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