L31 vortec heads

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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.The Vortec 5700 L31 (Vin code 8th digit "R") is a V8 truck engine. Displacement is 5.7 L. It is the last production Generation I small-block. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but without the reverse-flow cooling. As such, the L31 head is compatible with all older small-blocks ...Chevrolet Performance Valve Stem Seal ZZ4, Fast Burn 385, L98, LT4, L30, L31 Vortec heads. $3.91. $2.68 (You save $1.23) SKU: 10212810 Weight: 0.10 LBS Availability: Y Shipping: Calculated at checkout : Quantity: Share > Product Description. 10212810 - …L31 Vortec Heads For a very good, professional write-up on the Vortec heads, go to this Chevy High Performance article. When GM Performance Parts released the L31 Vortec heads for small-block Chevy engines in 1996, they were an instant hit with the hot-rodding crowd due to the great flow numbers (outflowing the venerable Bow Tie heads ...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 sbcThe 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 …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 ...

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.11400 posts · Joined 2002. #2 · Jun 28, 2012. It should be rather easy to tell if they are for a GM. It don't matter any what shape they are, it's effect on flow isn't enough to even worry about, especially in a street application. There's been SBC heads with "D" shaped ports, oval shaped, or the stock shape and unless you plan to spend some ...To begin with, L31 Vortec heads have 7/16" ROUND holes already in the heads- not slots - that the pushrods pass through. The earlier non self aligning rocker arm equipped heads have a 7/16" x 11/32" ovoid hole in them. If using 1.6-up ratio rockers, there's a chance the Vortec's 7/16" hole will not be long enough.Beginning in 1996 to '00, L-31 Vortec heads were installed from the factory on GM truck and van 350 engines. These newly designed for 1996, state of the art heads are made from cast iron and replaced the former swirl-port TBI heads that had been previously used on the GM truck 350.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 ...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.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 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 …

Sep 27, 2017 · The stock Vortec iron head will not tolerate more than 0.440-inch lift. We measured our stock iron heads right out of the box and the retainer-to-seal clearance was only 0.470-inch. Subtract the standard 0.050-inch clearance, this leaves only enough room for a 0.420-inch lift cam. That just won’t do. But don’t despair. Ramjet intake swap on stock 350 vortec L31. So I picked up a complete Ramjet intake manifold and also included was the Mpfi 4 ecu and harness that the ramjet crate engine uses. Currently running a dual plane gm perf intake and a sniper efi with hei and pulls really good. Want to swap the ramjet intake for looks and more power hopefully.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 ... engine asm, 350cid/330hp with vortec heads (1018) $4,118.84 $3,367.15 Vortec 8.0L $5,969.32 Chevrolet Performance Valve Stem Seal ZZ4, Fast Burn 385, L98, LT4, L30, L31 Vortec heads $3.91 $2.68This 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.

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Find CHEVROLET 5.0L/305 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.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 …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.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.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.JEGS 83201 - Intake Manifold Bolts for 1996-2002 Small Block Chevy w/5.7L L31 Vortec Heads $19.99 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

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 ...The heads are fresh vortec castings re-worked by Competition Products out of Oshkosh, WI. They are milled to 62cc chambers, were treated to a mild port job, and have 2.02 / 1.6 valves in them. Here's what I'm thinking: the ZZ4 roller cam (208/221 duration, .474/.510 lift), some comp cams self-aligning roller tipped lifters that I already …Exploding head syndrome refers to hearing a loud noise when falling asleep or waking up. Learn about other symptoms, causes, and how to treat. Despite its dramatic name, exploding ...The L31 Vortec head drops some bottom end torque compared to earlier heads, more cam doesn't help this unless you really pump up the compression. ... KB-193-30.This is a 12cc D cup piston with a 1.561 pin hgt hgt.It has a flat section that mates up to the quench pad on Vortec heads to give good squish effect,power,detonation …The stock cams that came on ALL 1996-2003 L31 Vortec 350's use a cam with lift specs of 0.412/0.428" 191/196° on a 111º LSA. And all 1996-2013 marine Vortec 350 engines engines, which use the same L31 Vortec 350 heads are used with a 196º/206º 0.431"/0.451" 109ºLSA, with 1.5:1 rockers.What are the casting numbers for the L31 vortec heads? Ive seen 906 and 062 castings but I dont know which is the L31. Also, what vehicles were these heads put …JEGS 513002 - Intake Manifold for 1996-2002 Small Block Chevy 350 Vortec with L31 Cast Iron Heads, Dual Plane [Satin] $161.99 JEGS 601210 - Flexplate Bolts Chevy 90-Degree V6, 265-454 V8 with 2-Piece Rear Seal, & Ford 289-460 V8 [High Strength]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 …When it comes to fastening two objects together, cap head bolts and cap head screws are two popular options. They both have a similar appearance, but they differ in their applicati...Jan 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.

From 1996 to 2000, GM truck and van 350 engines came equipped with L-31 Vortec cylinder heads. Built of cast iron, these powerhouse heads upped the horsepower of these engines by magnitudes. This is primarily attributed to the high port flow in the .300”-.500” valve lift area, wide bowl, and back-cut intake valve and exhaust.

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 …For stock power production, the hot ticket is the L31, Vortec-headed 350 offered from 1996-'02 in truck, van, and SUV applications. ... Even sporting the Vortec heads and a good intake and ...The L31 head uses a self guiding rocker, the head has no factory pushrod guide which used to be part of the pass through holes on the head for the push rods. ... No 350 Vortec came with a flat tappet cam, however, some 1996 350 Vortecs came with Swirl Port heads and TBI but all 350 Vortec engines use the same short push rod. - flat tappet …The L31 Vortec head drops some bottom end torque compared to earlier heads, more cam doesn't help this unless you really pump up the compression. ... KB-193-30.This is a 12cc D cup piston with a 1.561 pin hgt hgt.It has a flat section that mates up to the quench pad on Vortec heads to give good squish effect,power,detonation …In the 1 ton 1996 vans, there was an available engine that used a Vortec 350 L31 longblock with Vortec heads, but had a TBI injection unit and special TBI/Vortec intake manifold. The L31 350 was also available in the 3/4ton and 1 ton vehicles from 1996-2000 and if the GVRW was above 8600lbs the L31 got 4 bolt vertical iron main caps on the ...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 ...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 …In the 1 ton 1996 vans, there was an available engine that used a Vortec 350 L31 longblock with Vortec heads, but had a TBI injection unit and special TBI/Vortec intake manifold. The L31 350 was also available in the 3/4ton and 1 ton vehicles from 1996-2000 and if the GVRW was above 8600lbs the L31 got 4 bolt vertical iron main caps on the ...

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Dec 31, 2023 ... started working on the ol L31 350 vortec engine i picked up on marketplace. Shes a rusty mess but internals look great, allegedly 70k miles.Here's what you need to know if you want to hike Diamond Head on Oahu in the Hawaiian Islands. Update: Some offers mentioned below are no longer available. View the current offers ...The L31 Vortec cylinder heads represented a major design change in Gen I SBC heads. They could be used on any SBC block from 1955 through the end of the Vortec engine production because the mounting holes lined up properly and the water passages were the same as the cylinder heads from the past 40 years. Oddly enough, the Vortec …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.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 …Ever scratch your head when you're frustrated or thinking? HowStuffWorks found out how this tic became the signal for so many social expressions. Advertisement If you've ever had ...A-Premium Engine Aluminum Dual Plane Intake Manifold Compatible with Chevy GM Vortec E-Tech Heads Small Block SBC Gen I, 8Cyl 5.0L 305 & 5.7L 350-1996-2002-1500-6500 RPM. 5.0 out of 5 stars. 1. $135.99 $ 135. 99. FREE delivery Tue, Apr 2 . Only 6 left in stock - order soon. More results.replacing the the engine in my c10 with a l31 vortec crate engine with Edelbrock performer intake, sniper EFI, and MSD pro-billet HEI. I have never screwed with timing curves for low compression vortec heads. ... The Vortec heads can be considered "Fast Burn" because they don't need as much advance as the old Chevy heads to get … ….

The Vortec 5700 L31 (Vin code 8th digit "R") is a V8 truck engine. Displacement is 5.7 L. It is the last production Generation I small-block. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but without the reverse-flow cooling. As such, the L31 head is compatible with all older small-blocks ...The 1996-2000 350ci Vortec 5700 engines enjoy lots of aftermarket support to help improve the 255 hp and 330 lb-ft of torque they're rated for at the crank. An engine swap can be quite costly, so ...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 …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: …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.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 ...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.Aug 6, 2002. 6,401. Bremen, Ga. Yes the 1996-02 L31 350 vortec heads will bolt to ANY gen 1 350 engine. He will just need an 8 bolt vortec style intake rather than the std 12 bolt intake. He will also need the vortec style self alinging rocker arms and center bolt valve covers. Sep 13, 2011.Head gasket repairs can be expensive, but the cost can vary significantly depending on the cause of the issue and the type of repair needed. Knowing what factors impact the cost of...Are you looking for a new shaver head for your Norelco electric razor? If so, you’ve come to the right place. In this article, we’ll provide you with all the information you need t... L31 vortec heads, Mar 5, 2023 ... Everyone loves a budget build! Shooting for the best HP per dollar we can get out of $300 L31 5.7 Vortec engine, lets tear it down, ..., The aluminum Vortec heads are attractive because of the weight savings. The project car once had a much lighter engine (rotary) and I would like to avoid too much weight up front. ... A lot of this will also depend on your tuning.The factory L31 tuning is geared more for milage,emmissions,& to run on 87 octane.There is a good 20 HP to be …, The Chevy 6.0 liter small block engine is an eight-cylinder engine aligned in the V formation and is called the Vortec L96. As of 2015, it is used primarily in Chevy’s heavy-duty t..., A-Premium Engine Aluminum Dual Plane Intake Manifold Compatible with Chevy GM Vortec E-Tech Heads Small Block SBC Gen I, 8Cyl 5.0L 305 & 5.7L 350-1996-2002-1500-6500 RPM. 5.0 out of 5 stars. 1. $135.99 $ 135. 99. FREE delivery Tue, Apr 2 . Only 6 left in stock - order soon. More results., How are amnesia and head trauma related? What happens if you get bonked really hard on the head? Learn about amnesia and head trauma in this article. Advertisement We've all seen i..., As most kids are already back in school, my daughter is enjoying a couple weeks more of summer bliss before she heads to Pre-K with her friends. I know it... Edit Your Post Publish..., 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 ..., If you want to use guide plates on the SBC Vortec heads they need to be machined to use the plates. L-29 461 BBC 11.10@118mph 9-30-22. 10.65@125mph 406 with home ported Dart 215 heads. 10 sec. Vortec 062's 406 w/hyd. cam and stock rocker arms. 11.16@118mph 461 BBC 8:1 compression with junk peanut port heads. Like., 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 …, Bushwacker Drt Style Fender Flare - 4Pc (2019-2021 Silverado 1500) - 40984-02. $469.99. Add To Cart. Comp Cams Spring Kit, Gm L31 Vortec Cylinder Head, .510" Max Lift, Flat Tappet - 26906VCS-KIT Complete .510" max lift, drop-in valve spring kit for GM L31 Vortec Cylinder Heads This COMP Cams Valve Spring Kit is designed to maximize the ..., Sep 29, 2011 · Re: l31 vortec heads. The biggest advantages of the aluminum E-tec 170's is the ability to handle a high-lift cam and the weight savings. The stock vortecs can only take about .450" lift. For a street smallblock, the E-tec 170 is a great choice. [FONT=&quot]“A society that puts equality before freedom will get neither. , 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. …, JEGS 83201 - Intake Manifold Bolts for 1996-2002 Small Block Chevy w/5.7L L31 Vortec Heads $19.99 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, Dec 20, 2009 · "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. , Jan 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. , From 1996 to 2000, GM truck and van 350 engines came equipped with L-31 Vortec cylinder heads. Built of cast iron, these powerhouse heads upped the …, Manish Maheshwari, the head of Twitter India, has taken a new role at the company and is relocating to the U.S., the latest in a series of developments for the American social gian..., 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..., 97 L31 Vortec engine, stock bottom end 9.6 Compression ( .015 head gaskets for .039 squish ) SCR about 7.87 Comp xr264hr cam Weiand 8121 intake Edlebrock 750 carb HEI ignition Hooker 1 5/8" full length headers 2000 stall converter th350 trans 3.73 posi rear end 3000# vehicle I have changed the springs and retainers on the L31 heads to allow for ..., Gas prices have fallen below $3 a gallon in nearly half of the US as demand slows heading into the Christmas holiday season. The average price for a gallon of gas has dropped below..., bobbyv Discussion starter. 49 posts · Joined 2004. #1 · Aug 23, 2010. I've got a 99 Suburban with the L31 5.7 vortec engine. These motors seem to really stop breathing after 4k RPMs. What's really holding them back? Vortec heads are known for good flow and after opening up the EFI intake, it seems to me that it should flow to 5500 …, What are the casting numbers for the L31 vortec heads? Ive seen 906 and 062 castings but I dont know which is the L31. Also, what vehicles were these heads put …, 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 ..., 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. ..., 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 Build Part List! Lots of guys asked for a parts breakdown of what was used in the budget Vortec build, so here it is! Sorry for the long video but..., The Elgin/Pioneer RV1943X valve springs will not fit the L31 Vortec heads. The RV1943X valve srings are 1.250" O.D. x .869" I.D. w/damper. (Remove the damper and the springs are 0.883" I.D.) 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., Chevrolet made Vortec engines beginning in 1986, and as of 2014, these engines are still available. However, General Motors is creating products under the Vortec name now. The firs..., Jul 11, 2014 · In the last 2 1/2 years he's put a couple of hundred passes on it all between 12.50's to 12.80's! I would run yours until it breaks and then upgrade.:thumbsup: '62 Chevy Bel Air 461bbc AFR 335, 9x30 slicks, Powerglide, 4.30 gear, stock suspension and drum brakes. 6.320 at 109.28mph-9.942 at 135.91mph. F. , Other manufacturers may pattern their products after the GM design- but they're NOT Vortec heads, and the name "Vortec" covers a LOT of ground- it was used on GM engines that were VERY low performance powerplants, as well as the L31 Vortec engine that originally had the Vortec heads most guys are referring to when they say …, View Details. $1,600.66. Availability Date Unknown. FREE Shipping. Lowest Price Guarantee. Add To Cart. JEGS Cast Iron Vortec Cylinder Head has fast burn combustion chambers and high-velocity intake and exhaust ports. This head performs great right out of the box but can be mildly ported and milled up to 0.040 in. and requires a Vortec-style ..., 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. , The heads you linked are the Summit brand Vortec.They are not a true L31 head,but,more of a replacement head.The Vortecs from SDPC are true Vortec L31 cylinder heads.IDK for sure on the stock sets,but,sets modified sets will have verified intake runner volume & chamber volume in cc's with each set of heads.The runners usually come in …