L31 vortec heads. Find CHEVROLET 5.7L/350 Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase ... Cylinder Head, Vortec, Cast Iron, Assembled, 67cc Chamber, 175cc Intake Runner, Chevy, Small Block, Each. Part Number: SUM-151124. 4.57 out of 5 stars. Estimated Ship Date: Today.

The only truly relevent info I found on Vortec heads is from this thread, along with snippets from guys allegedly running Vortec heads that posted in the various threads on building 383s that I sifted through: Vortec Head Swap thread on PBB At least you can tell I searched. :flipoff2: Evan Oh, here's a decent current thread on building a 383:

L31 vortec heads. JEGS 513036 - Cool Gap Intake Manifold for Small Block Chevy with 1996-2002 Vortec L31 Cast Iron Heads, Dual Plane [Satin] $219.99. JEGS 72352 - Fuel Stabilizer [4 oz. Bottle] $4.91. PRW 0835019 - Self-Aligning Sportsman Series Steel Rocker Arms 1955-86 Small Block Chevy 262-400. $155.94.

Scoggin-Dickey’s New TPI Intake for the Vortec Head. Few cylinder heads have hit the small-block Chevy world with as much impact as the GM Performance Parts Vortec iron cylinder head. By now you ...

Re: maximum you can mill Vortec heads. by DaveMcLain » Thu Jan 13, 2011 1:31 pm. When you angle mill the head you will take just about all of the material off of the exhaust side where the chamber is wide and deep and nearly none at all off of the quench areas where it doesn't help to reduce the chamber volume anyway.It has .430/.450 lift with 1.5 rocker arms & will work with the stock Vortec springs,although,I would strongly suggest better springs,or,at least new replacements. These cams sell brand new for about $170,or,you can often find them as new pullouts on Ebay from $125 to $150.Not a lot more than you would spend for a flat tappet cam & new …

You both pay the bills, and you both raise the kids, so does the IRS see you both as heads of households? Read more at HowStuffWorks. Advertisement Head of household is one of the ...Chevrolet Performance Parts L31 Vortec Cylinder Cast Iron Heads have set the standard for proven performance and budget spending . The best out-of-the-box head for the money! Excellent flow produces broad torque and killer power. Stock springs are good up to 0.450" lift.Aug 25, 2011 · To run over .480" lift on stock L31 heads will require 787-16 Comp Cams retainers and any Beehiove spring, 26915/26918, PAC beehives or 02-04 LS6 behives. Stock the TPI 305 ran 15.5@88mph, TPI/L31 355 ran 13.8@99mph on stock 85chip and 32 lb/hr injectors. Stock an L31 is rated at 255 sae net hp@ 4600rpm, and 330 sae net lb/ft torque at 2800rpm. To run over .480" lift on stock L31 heads will require 787-16 Comp Cams retainers and any Beehiove spring, 26915/26918, PAC beehives or 02-04 LS6 behives. Stock the TPI 305 ran 15.5@88mph, TPI/L31 355 ran 13.8@99mph on stock 85chip and 32 lb/hr injectors. Stock an L31 is rated at 255 sae net hp@ 4600rpm, and 330 sae net lb/ft torque at 2800rpm.Dec 22, 2008 · When the Vortec heads were released in '96 (onL31-equipped pickups), it didn't take a brain surgeon to figure out they were an easy 25-30hp bolt-on. As Nicky told us, "The ports and the combustion ... LS6 springs on Vortec heads seems like a good mild upgrade/replacement for old stock L31 springs. My questions are: ... Didn't catch that Tech.The 1.200 is the coil bind on these springs.These are the stock springs used on the L31,L30,350 HO,350 Ramjet,& the HT383. Save Share.This 383 stroker is designed for use in 1996 - 2000 Chevrolet Pickup or SUV that was originally equipped with a 350ci (5.7L) engine. No ECU tuning or recalibration is required. Advertised horsepower gains were achieved on chassis dyno, w/ factory EFI and ECU, in a Vortec equipped, otherwise factory, GM truck.The Vortec HD 350 L31 crate engine leverages the strength of a strong rotating assembly secured in a brand-new block with four-bolt mains, along with Vortec iron cylinder heads with upgraded exhaust valves or heavy duty applications. A roller camshaft optimizes drivability and airflow capability. See more details.The only van that had Vortec heads along with TBI were the 3500(1 ton) vans(. They had an L31/roller cam/vortec heads engine with TBI injectors. The intake these vans used is where the GMPP TBI/Vortec head conversion intake came from. 2. Vortec 5700 hp ratings seem to be 255 to 350. Is there anyway of finding out what this is …What I'm wondering is if putting roller rockers with a 1.6:1 ratio would create too much lift. The stock self-aligning rockers have a ratio of 1.52:1. Stock the Vortec heads only accommodate about .42 or so, (I've read varying specs about that) but the stronger LS1 springs are supposed to allow more lift because they keep the valve float down.

The L31 Vortec truck/RV heads have a valve guide boss which serves as a spring register and must be machined to fit the RV1943X valve springs. You need to measure the guide boss diameter on the heads and compare it to the inner diameter of the valve springs. Save Share. Like.Order the L31 Chevy Vortec 350ci/5.71 replacement engine from JEGS High Performance! Free Shipping over $199* Same Day Shipping before 10pm* Price Match Guarantee; Free Shipping over $199* Same Day Shipping before 10pm* ... JEGS 83201 - Intake Manifold Bolts for 1996-2002 Small Block Chevy w/5.7L L31 Vortec Heads …The L31 heads from the late-model 350 Vortec engine, introduced early in 1995, is the other type of cylinder head you need to look for on the used market. This is probably the best cylinder head casting that Chevrolet has ever produced for a production small block Chevy. The casting quality is as good as the best aftermarket iron heads, and its ...

May 17, 2016 ... A few facts about 5.7L Vortec heads. ... The truth about the "Double Hump" heads. The Reluctant Gearhead ... L31 Low Buck Build (Part 2). CUTTER'S&nb...

JEGS 210003 - Intake Manifold Gasket Set for Small Block Chevy 1985-1989 5.0L/5.7L TPI and 1996-2002 5.7L L31 Vortec Engines $16.49 JEGS 513002 - Intake Manifold for 1996-2002 Small Block Chevy 350 Vortec with L31 Cast Iron Heads, Dual Plane [Satin]

The only van that had Vortec heads along with TBI were the 3500(1 ton) vans(. They had an L31/roller cam/vortec heads engine with TBI injectors. The intake these vans used is where the GMPP TBI/Vortec head conversion intake came from. 2. Vortec 5700 hp ratings seem to be 255 to 350. Is there anyway of finding out what this is …Description. Source. Price. Chevy 350 short-block. ebay Motors. $1,349.95. AFR 195cc Eliminator Street Heads #1034. eBay Motors. $1,648.03. Comp Cams 12-467-8 280XFI hydraulic roller cam sbcJan 15, 2014 · A truck manifold from a 1987-1999 5.0/5.7 will work. As stated, the only reason to get a 1996-99 Vortec 305/350 manifld is if you want to supply EGR gasses to the intake. here is a set of 1996-99 truck or 1996-2000SUV or 1996-2002 van Vortec L30/L31 exhaust manifolds. Same but only the drivers side showing the EGR supply flange and fitting. May 5, 2003 · Modifying Vortec Heads For 0.525-Inch Valve Lift ... Chevy introduced its Vortec cylinder head on the L31 truck engine and it didn't take long for enthusiasts to bolt them on their engines and ...

Beware of "overkill" with Vortec heads on a 305 CI Chevrolet engine. On a 305 CI engine, the bore is too small for the stroke, or what is known as a poor bore:stroke ratio ... Actually the L31 Vortec heads will fit on a 305 as far as valve clearance is concerned. But they do lower compression and the larger valves and ports will cost … Edelbrock part #7516 RPM Air-Gap intake manifold is based on the powerful Performer RPM Vortec #7116. This single four-barrel intake is designed for 262-400 c.i.d. Chevy V8's with 1996 and later Vortec (L31) cast iron or Edelbrock E-Tec aluminum heads. The air-gap design features an open air space that separates the runners from the hot engine ... Chevy Vortec Aluminum 350 Cylinder Heads 64cc 2.02/1.60. Chevy Vortec Aluminum 350 Cylinder Heads 64cc 2.02/1.60. THIS CYLINDER HEAD HAS THE FOLLOWING: 190CC intake ports. Vortec design combustion chamber. Vortec style intake manifold bolt pattern. Angle or Straight plug design. Raised intake roof for enhanced air flow. Extra thick deck surface.It happens to even the best DIYer: the simple process of removing a screw becomes a struggle when the screw refuses to budge and the head of the screw becomes stripped. But not all...Find Chevrolet Performance Vortec Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Chevrolet Performance cast iron Vortec cylinder heads will fit 1958 and later small block Chevy engines, and offer a 20 to 40 hp increase over earlier cast iron small block heads. Features include fast burn combustion chambers, and a high …L31 Vortec Conversion to Carb. Jump to Latest Follow ... With L31 heads, I would start at 34 degrees initial + mechanical, all in by 2800. More cam will want more initial ignition timing, so increase the initial and limit the mechanical to get to your 34. Once the motor is running, you can try rocking the timing back and forth a couple of ...Vortec style intakes to match the Vortec intake/head bolt pattern are now available for two or four barel carbs, TBI and TPI setups. 12529093 - Vortec L31 350 bare cylinder head, cast iron, seats cut for 1.94"/1.5" valves, 170cc intake runner volume, 64cc chambers, no springs, retainers or valves, has bracket/accessory holes, use with Vortec ...The heads used on the L30 Vortec 305, last 3 casting digits 059, would be the best. Flow is close to the L31 Vortec 350 head but the chamber is 58cc instead of the 64cc used on the 350. The 64cc Vortec 350 chamber will kill the compression ratio on a 305 unless you change to flat top pistons, use a thin head gasket, and mill the heads to reduce ...If your budget is tight, I’d suggest a set of affordable iron Vortec heads. These heads flow much better than almost any production Chevy head. ... I’m looking to upgrade the cam in my stock L31 vortec SBC. The stock iron heads have been ported and flow EXhaust 51, 96, 137, 155, 164, 169 Intake 62, 134, 189, 224, 232, 236 chambers …The 64cc Vortec 350 chamber will kill the compression ratio on a 305 unless you change to flat top pistons, use a thin head gasket, and mill the heads to reduce the chamber volume. This will kill your whole budget. If you just bolt-on L31 Vortec 350 heads with a common .041" thick 305 head gasket you are going to end up with compression …But perhaps the best news of all is that these springs will bolt right onto a stock Vortec head with no machining required. These springs also increase the amount of available valve lift from 0. ...Cam Setup For L31 350 Vortec. TStowell. Feb 1, 2024. 350 vortec build cam l31 performance streetrod. Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission. 1.L31 Vortec heads don't use valve rotators.Never have. Save Share. Like. ... L31 Vortec 350 LD 1/2 ton trucks 3/4 ton trucks under 8600lbs GVRW 5.7L 350 96 (L31) (Vortec) light duty, 2-bolt main. 12530282 350 CID New 5.7L 1999-2000 Chevrolet, GMC CK1 (L31) M30 (exc. NM8)11400 posts · Joined 2002. #4 · Feb 9, 2007. I don`t know what they flow. However, years ago I built a 305 roller engine with 305 vortec heads. The pistons were basic flat tops .030 over, the cam was a GM grind, was rather mild around 204 duration, Double roller timing chain, edelbrock intake, Q-jet carb, stock exhaust manifolds, single ...Apr 22, 2022 ... In this video Robert shows you how he and Joe rebuilt a set of 906 Small Block Chevy Vortec Cylinder Heads!A controversial display of “shrunken heads,” or tsantsa, made by the Shuar and Achuar people of Ecuador and South America have been removed from Oxford’s Pitt Rivers Museum. After ...The new single plane intake manifold is designed to provide a broad RPM powerband for high-performance street/strip engine applications to a maximum engine speed of 7500 RPM. The carburetor-mounting pad is designed to accept all stock or aftermarket square-bore carburetors with manual or electric chokes. These intake manifolds are designed to …A truck manifold from a 1987-1999 5.0/5.7 will work. As stated, the only reason to get a 1996-99 Vortec 305/350 manifld is if you want to supply EGR gasses to the intake. here is a set of 1996-99 truck or 1996-2000SUV or 1996-2002 van Vortec L30/L31 exhaust manifolds. Same but only the drivers side showing the EGR supply flange and fitting.

The only van that had Vortec heads along with TBI were the 3500(1 ton) vans(. They had an L31/roller cam/vortec heads engine with TBI injectors. The intake these vans used is where the GMPP TBI/Vortec head conversion intake came from. 2. Vortec 5700 hp ratings seem to be 255 to 350. Is there anyway of finding out what this is … JEGS crate engines feature a 36 month/unlimited mileage warranty.This engine was designed as a direct replacement for 1996-2000 Chevy & GMC pickups, SUV's, and van applications. These vehicles introduced the L31 5.7L small block featuring Vortec cylinder heads that were developed for maximum power and efficiency. how well do l31 vortec 350 heads work? how can i make 400 hp from a junkyard 350? check out this video where i took a ... can vortec 350 chevy heads make power? how well do l31 …The story of Newton discovering gravity by getting hit in the head with an apple is a classic. Is there any truth to it? Find out at HowStuffWorks. Advertisement In 1666, the Great...Feb 24, 2022 · 97 L31 Vortec build. hello, I have a 97 Vortec engine that I am going to overhaul, I am wondering if anyone could shed some light on what would be the best upgrades to do but also be able to use the stock intake/ spider injection. So far I am going to do flat top pistons, LT4 hot cam, roller rockers and upgraded valve springs. The Vortec 5700 L31 (VIN code "R") is a 5.7L V8 truck engine. It is Chevrolet's last production first-generation small-block. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but lacking the LT1's reverse-flow cooling and higher compression.

Get a newer PCM used in the 2001-2002 Express vans with the L31 350. These PCM's have the last 4 digits of 0411, are silver in colour and have dual 80 pin connectors. These PCM's were found in many Camaro's and Vettes as well, but when flashed with a 2001-2002 vans Vortec 350 calibration can use the stopck flat crab style …"Vortec" heads, an RPM "Gap" intake manifold, cam, timing set, and some gaskets. Edlebrock claims 435 hp on a 9.5 CR roller-cam 350 with that set of goodies installed. Plan is to have a bottom-end that will safly get the most out of my further investments (even if Edlebrock's claims are a bit idealized), and you guys are a big help.49 posts · Joined 2004. #1 · Jan 15, 2007 (Edited) is it possible to change the spyder injector style manifold of a L-31 5.7L Vortec V-8 to TPI without major hassle. i recently picked one up at the scrap yard and was wondering what it would take to swap out injection styles if at all possible. Also i will probably be making the 350 into a 383 ...Scoggin Dickey Vortec Heads. These heads with less lift capability were the original equipment on '96 to '00 HD Chevy trucks and vans. Some of the fellows on this board have cautioned using a lot of lift with these upgraded springs/retainers, but I personally wouldn't be concerned with using a cam with up to 0.525" lift with them. Of …With L31 heads, I would start at 34 degrees initial + mechanical, all in by 2800. More cam will want more initial ignition timing, so increase the initial and limit the mechanical to get to your 34. Once the motor is running, you can try rocking the timing back and forth a couple of degrees, but the L31 chambers are very efficient and should ... The L31 heads from the late-model 350 Vortec engine, introduced early in 1995, is the other type of cylinder head you need to look for on the used market. This is probably the best cylinder head casting that Chevrolet has ever produced for a production small block Chevy. My earlier posts contain info on building a 9:1 305 with 906 big valve Vortec heads. 305V8 3.75 bore 3.48 stroke. Mill .030 62cc chambers. GM5115 .027x 4.00" bore gasket. under deck cc on 85 305 12cc. Comes out to about 9.0:1. A Performer cam, and junkyard 3800GM beehive springs and retainers work good.As many know, Chevy Vortec heads make great power out-of-the box but can’t take more than about .450-.470” valve lift without binding. The common solution to this issue is to machine the valve guides, and spring seats to allow upgraded springs and more clearance for more lift. Well, according to Salle Chevrolet, you can use Crane’s Spring ... Beehive .600" Max Lift Spring Kit w/ Chromemoly Retainers for '18+ Ford Coyote. .510" Lift Beehive Valve Spring Kit for GM Vortec Hydraulic Flat Tappets. $188.95. Complete .510" max lift, drop-in valve spring kit for GM Vortec Cylinder Heads for use with hydraulic flat tappet camshafts. There are many aftermarket intakes that accommodate a carburetor and fit these head's unique port and bolt patterns. The L30/L31 Vortec head does not have push rod guides, like the LO5 Swirl Port engine immediately proceeding the Vortec these heads use self guiding rockers.The story of Newton discovering gravity by getting hit in the head with an apple is a classic. Is there any truth to it? Find out at HowStuffWorks. Advertisement In 1666, the Great...Buy NEW Chevy 350 5.7 VORTEC L31 Cylinder Heads PAIR # 906 062 Suburban 1996-2002 (CORE RETURN REQUIRED): Cylinder Heads - Amazon.com FREE DELIVERY possible on eligible purchases.Scoggin Dickey Vortec Heads. These heads with less lift capability were the original equipment on '96 to '00 HD Chevy trucks and vans. Some of the fellows on this board have cautioned using a lot of lift with these upgraded springs/retainers, but I personally wouldn't be concerned with using a cam with up to 0.525" lift with them. Of …L31 Vortec heads don't use valve rotators.Never have. Save Share. Like. ... L31 Vortec 350 LD 1/2 ton trucks 3/4 ton trucks under 8600lbs GVRW 5.7L 350 96 (L31) (Vortec) light duty, 2-bolt main. 12530282 350 CID New 5.7L 1999-2000 Chevrolet, GMC CK1 (L31) M30 (exc. NM8)The L31 Vortec 350 that was installed in all GM half ton trucks (Pick-ups, Tahoes, Suburbans, Vans) put out 255 hp and 330 lb-ft. Whoever told you 430-450 ftlb of torque was off by 100 lb-ft. 600 lb-ft is possible but very expensive with a small block. If you want the motor to live a long life plan on adding a forged crank and rods, and I'd ...Find CHEVROLET 5.7L/350 Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase ... Cylinder Head, Vortec, Cast Iron, Assembled, 67cc Chamber, 175cc Intake Runner, Chevy, Small Block, Each. Part Number: SUM-151124. 4.57 out of 5 stars. Estimated Ship Date: Today.This camshaft is a great upgrade for 1996-2000 Chevy/GMC trucks equipped with the L31 Vortec 350 Engine. This cam is great for additional bottom end torque. If installed in one of these trucks, a custom computer re-program is needed. ... Will this work on a SBC 350 L31 block with Vortec heads and a Pro Flo 4 EFI system? Asked by: …The Vortec HD 350 L31 crate engine leverages the strength of a strong rotating assembly secured in a brand-new block with four-bolt mains, along with Vortec iron cylinder heads with upgraded exhaust valves or heavy duty applications. A roller camshaft optimizes drivability and airflow capability. See more details.The specifications of the GM 4.8 liter V8 Vortec L20 small block engine include a displacement of approximately 4807 cubic centimeters and a compression ratio of 8.8 to one. It use...

17935 posts · Joined 2007. #4 · Jun 8, 2015. Timing tapes just don't stay on very long. 10 degrees on the factory L31 cam is a good place. The heads burn fast so gobs of total isn't necessary 32 to 34 degrees total is plenty. I'd scrap the the plastic timing cover and go with a decent metal one, if you suspect you' might replace the cam one ...

Apr 16, 2009 · Also intriguing is a complete '96 to '02 L31 truck and van 350 Vortec engine (PN 12530282). This engine already has the right heads, plus it uses a hydraulic roller cam.

We mentioned that these smaller chamber heads will also improve the compression ratio and this is one reason why the Vortec heads are a good choice. With a 76cc chamber head on a 350 Chevy, your compression ratio will be around 8.5:1 assuming the use of a 0.041 inch thick head gasket and the piston is between 0.015 to 0.020 inch below the deck ...The L31 heads from the late-model 350 Vortec engine, introduced early in 1995, is the other type of cylinder head you need to look for on the used market. This is probably the best cylinder head casting that Chevrolet has ever produced for a production small block Chevy. The casting quality is as good as the best aftermarket iron heads, and its ...The Vortec iron small-block Chevy head offer 1.94/1.60-inch vales and 64cc combustion chambers and flow better than any other production iron small-block Chevy head. Their limitation is a limited valve lift potential. Machining the guides to increase the retainer-to-seal clearance is an inexpensive way to convert these heads to use a bigger …The valve size is a notable difference between the 906 and 062 Vortec heads. The 906 heads have 1.94-inch intake valves and 1.50-inch exhaust valves, while the 062 heads have slightly larger 1.94-inch intake valves and 1.60-inch exhaust valves. This difference in valve size can affect the engine’s overall performance, as we will discuss …Any intake manifold (LS1, LS6, LS2) will work with these heads as well as Vortec intakes from cathedral port-headed variants. 241 castings (the casting number is found near the corner of the head ...The new single plane intake manifold is designed to provide a broad RPM powerband for high-performance street/strip engine applications to a maximum engine speed of 7500 RPM. The carburetor-mounting pad is designed to accept all stock or aftermarket square-bore carburetors with manual or electric chokes. These intake manifolds are designed to …Nov 4, 2019 · Description. Source. Price. Chevy 350 short-block. ebay Motors. $1,349.95. AFR 195cc Eliminator Street Heads #1034. eBay Motors. $1,648.03. Comp Cams 12-467-8 280XFI hydraulic roller cam sbc May 29, 2019 ... Vortec 305 or 350? Time to ID the heads, engine & get it out of the donor 1996 GMC Sierra 4x4 truck. Then use my modified TCI 896500 Floor ...You both pay the bills, and you both raise the kids, so does the IRS see you both as heads of households? Read more at HowStuffWorks. Advertisement Head of household is one of the ...

wsfs customer service numberbear market camdenton mo32oz literschina one palm harbor L31 vortec heads how many calories are in a candy cane [email protected] & Mobile Support 1-888-750-2720 Domestic Sales 1-800-221-7905 International Sales 1-800-241-2918 Packages 1-800-800-2711 Representatives 1-800-323-2915 Assistance 1-404-209-4190. Weiand is proud to announce the availability of their 142 roots-style superchargers and intake manifolds for small block Chevy Engines with the Vortec (L31) cylinder heads. These street performance blowers use a new CNC machined 2-lobe rotor design that no centrifugal blower can compete with.. pappadeaux duluth ga LS6 springs on Vortec heads seems like a good mild upgrade/replacement for old stock L31 springs. My questions are: ... Didn't catch that Tech.The 1.200 is the coil bind on these springs.These are the stock springs used on the L31,L30,350 HO,350 Ramjet,& the HT383. Save Share.Specs on engine build in progress: 97 L31 Vortec engine, stock bottom end 9.6 Compression ( .015 head gaskets for .039 squish ) SCR about 7.87 Comp xr264hr … concrete bench moldsmedium drop fade haircut JEGS 513036 - Cool Gap Intake Manifold for Small Block Chevy with 1996-2002 Vortec L31 Cast Iron Heads, Dual Plane [Satin] (13) $197.99. JEGS 513071 - Intake Manifold for 1996-2002 Small Block Chevy 350 Vortec, Hi-Rise Single Plane [Satin] (1) $238.13. JEGS 513001 - Intake Manifold for 1955-1986 Small Block Chevy 262-400, … bo nix parentsbreaking ac facebook New Customers Can Take an Extra 30% off. There are a wide variety of options. Sep 10, 2022 ... Easy .550+ Lift with No Machine Work! (L31 Build Part 6). CUTTER'S PERFORMANCE•26K views · 12:35 · Go to channel · SBC Chevy - Testing 6&n... Edelbrock part #7516 RPM Air-Gap intake manifold is based on the powerful Performer RPM Vortec #7116. This single four-barrel intake is designed for 262-400 c.i.d. Chevy V8's with 1996 and later Vortec (L31) cast iron or Edelbrock E-Tec aluminum heads. The air-gap design features an open air space that separates the runners from the hot engine ... The 350 HO engine has production Vortec cast iron cylinder heads. These cylinder heads were first used on 1996 trucks with fuel injection, RPO L31. The intake and exhaust ports are very similar to the 1992-1995 Corvette 350 LT1 heads. The heads include 1.94” intake valves and 1.50” exhaust valves with pressed-in 3/8” studs.