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Cost is $2,100.00 plus shipping. A COMPLETE set New, New Chevy Vortec heads of "CNC-UnderCover Ported" with the above listed " CNC-UnderCover Porting" modifications, machined for screw-in studs, 11/32″ stainless valves, springs for a flat tapped or hydraulic cam, spring locators, steel retainers, machined valve locks, surfaced with a.

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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), efficient 64cc chambers, and great price (under $500/pair, assembled). ... The biggest issue in my opinion is the maximum lift.

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Sep 26, 2008 · Head #1: .506" min / .509" max Head #2: .535" min / .545" max Allowing for .050" safety margin, and using the minimum clearance for each head, max safe valve lift on the two heads would be .456" for head #1 , and .485" on head #2. Both of these heads are 1997 castings, and I'm pretty sure they're off the same engine..

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2018-4-6 · The original answer was related to modifying the heads to accept more valve lift. Stock Vortec heads are limited to 0.425- to maybe 0.450-inch lift. ... not to sure of the tipe of headers i will be using at this point i would like to go with a camshaft with around a 0.489 max lift and a duration of 226/236 give or take and have a 2200 to 2400.

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The Vortec and LS engines shared a similar cast iron engine block design. Big differences between the two engines include the crank bearings, timing cover, water pump, ignition systems, and cylinder heads.The Chevy 5.7L Vortec engine was engineered to produce more power, torque, and engine response while improving overall gasoline fuel economy. Pair of sbc Vortec heads.

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Mar 21, 2020 · The Debut. 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..

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How to check and install LS beehive valve springs on Vortec heads + check for max lift!Ls6 springs work great for mild roller cams!An easy at home way to che....

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ProMaxx Performance Small Block Chevy Vortec Cylinder Heads. Save $20 Off $200, $50 Off $500, $100 Off $1000 Orders - Promo Code: SUMMER exclusions ... valve springs with .575 in. max lift for hydraulic flat tappet camshafts or .500 in. max lift for hydraulic roller camshafts, 3/8 in. screw-in studs, and guide plates. Share this page: Filter.

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Chevy Vortec Aluminum 350 Cylinder Heads 64cc 2.02/1.60. THIS CYLINDER HEAD HAS THE FOLLOWING: 190CC intake ports. Vortec design combustion chamber. ... (max .530 lift) & premium Viton valve stem seals. All of our cylinder heads are vacuum tested!! 12 MONTH/12,000 MILE WARRANTY! NOTE: MUST USE .100″ LONGER PUSH RODS WITH THESE CYLINDER HEADS.

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Aug 08, 2009 · spring retainer and valve seal at max lift, then you end up with room for a max lift of between .420 and .440 depending on the casting. I tried running a .487 .490 lift cam on a stock set of Vortecs and I beat the hell out of the valve seals. Just because your getting away with it doesn't mean you have proper clearance..

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0L (LQ4) truck engine I installed in spring of 2005, ended up selling it on Ebay Junkyard TBI unit from 1992 GMC 2500 Van with 350 Motor 7 and 95 up for the 4 030 over pistons, larger edelbrock cam, vortec heads conversion. When Vortec heads are fitted with higher than stock ratio arms or high valve lift cams, the stock pushrod holes must be enlarged to allow for increased lateral.

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spring retainer and valve seal at max lift, then you end up with room for a max lift of between .420 and .440 depending on the casting. I tried running a .487 .490 lift cam on a stock set of Vortecs and I beat the hell out of the valve seals. Just because your getting away with it doesn't mean you have proper clearance.

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 · Max Lift 0.630'' Spring Rate 462 ... It appears that a lot of builders using vortec heads and cams under 0.500 lift are ok with those springs. The lunati springs just might be a tad too stiff with the 462 lb-in" spring rate with a hydraulic flat tappet cam. The Comp springs are 370 lb-in".

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1 day ago · Search: Vortec Block Vs Tbi Block. Throttle & Auto Trans Kickdown Bracket #8030 SBC 1995 and Earlier (Non-Vortec) $63 Step By Step 134-2004: Chevrolet Small Block 12pt, 3/8 wrenching You can determine the RPO code if you have the Vehicle Identification Number (VIN) from the original vehicle '88-'95 used TBI with the low performance TBI heads '88-'95 used TBI.

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hardened retainers, valve locks, hi-pro valve springs(max .530 lift) & premium Viton valve stem seals. All of our cylinder heads are vacuum tested!! 12 MONTH/12,000 MILE WARRANTY! NOTE: MUST USE .100″ LONGER PUSH RODS WITH THESE CYLINDER HEADS. FLOW: 300 400 500 600 700 INTAKE 191.0 231.0 256.0 258.0 264.0 EXHAUST 140.0 168.0 184.0 192.0 200.0.

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some of those heads are just gm vortec heads with minor machine work and better springs with more clearance work and in some cases screw in rocker studs which does improve the heads and keep in mind theres standard 170cc vortec truck heads, that make killer tq and the large port vortec heads that can easily support a good deal more hp.

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hardened retainers, valve locks, hi-pro valve springs(max .530 lift) & premium Viton valve stem seals. All of our cylinder heads are vacuum tested!! 12 MONTH/12,000 MILE WARRANTY! NOTE: MUST USE .100″ LONGER PUSH RODS WITH THESE CYLINDER HEADS. FLOW: 300 400 500 600 700 INTAKE 191.0 231.0 256.0 258.0 264.0 EXHAUST 140.0 168.0 184.0 192.0 200.0.

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 · Vortec heads (and most others) like straight stemmed valves. Undercut valves create unwanted turbulence and a decrease in intake charge velocity (they add volume (slowing the gases) to the overall "port" volume just behind the valve where max velocity is required.) Generally speaking, Vortec's stall at between .500” and .550” valve lift.

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Series One 185 SBC Cast Iron. (Sold in Pairs) $ 822.00 – $ 1,357.00. The 185 Vortec has taken the Vortec head to the next level. Bigger runner and bigger valves mean more power! Just ask dirt track racer Shawn Guffey, who has won every race and back to back track championships since installing Vortec heads on his A Hobby ride. Spring Options..

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1 day ago · Search: Vortec Block Vs Tbi Block. Throttle & Auto Trans Kickdown Bracket #8030 SBC 1995 and Earlier (Non-Vortec) $63 Step By Step 134-2004: Chevrolet Small Block 12pt, 3/8 wrenching You can determine the RPO code if you have the Vehicle Identification Number (VIN) from the original vehicle '88-'95 used TBI with the low performance TBI heads '88-'95 used TBI.

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Jan 30, 2008 · January 31, 2008, 08:16 AM. Re: vortec head, max effort horsepower? I think the class rules are 358 ci, stock production vehicle heads and a 480 net VALVE lift. apparently there is no compression rule. I'm still trying to grasp the concept, by my math and my end of the argument was that 490 HP was about the limit for a STOCK vortec head..

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Jan 04, 2014 · What they aren't is an all-out racing head designed to feed a steady supply of air to a big(ger) inch motor spinning all kinds of RPM. **Edit** Also, Vortec heads do well with split lift/duration, but not favoring the intake side. Exhaust lift should be ~.010-.020" higher than intake and the duration should be ~5-10* longer..

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All build up with Vortec heads must have had the upgraded springs ect. since they used cams with lift in excess of the max .450. My question is really whether the stock <b>Vortec</b> <b>heads</b> with a cam lift under .450 will make 300-<b>350</b> HP with 9.5 CR, RPM Performer intake, Quadrajet carb and block hugger headers.

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Complete .510" max lift, drop-in valve spring kit for GM Vortec Cylinder Heads for use with hydraulic flat tappet camshafts.111 LBS SEAT LOAD @ 1.750308 LBS OPEN LOAD @ 1.240386 LBS/IN RATE1.180 MAX COIL BIND.510" max lift.

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Its common knowledge Vortec heads have a problem w/ retainer to seal clearance. The stock retainers and springs do not allow for more then around .460" lift. ... Seals which are not fully seated will reduce maximum lift capacity. OE GM Vortec heads normally use: 11/32" X .552" seals. (.552"-.555") Be aware some aftermarket heads (such as engine.

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The flow should rise very quickly. For example: Lets take a head that flows a maximum of 300CFM. The lower the lift at which that number is reached, the better the port design. If maximum flow is reached at .500" lift the head will produce a better power curve than if the valve must be opened to .700" lift or more to get the flow. A head that .... Its common knowledge Vortec heads have a problem w/ retainer to seal clearance. The stock retainers and springs do not allow for more then around .460" lift. ... Seals which are not fully seated will reduce maximum lift capacity. OE GM Vortec heads normally use: 11/32" X .552" seals. (.552"-.555") Be aware some aftermarket heads (such as engine.

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Stock Vortec heads typically have about 480 horsepower and are naturally aspirated. As for a double-hump cast head, it can only generate between 25 and 40 horsepower less. The output depends on the size of the valve. The maximum valve lift that you can expect from a Vortec cylinder head can vary from .460-inch up to about .480-inch.

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Sep 26, 2008 · Head #1: .506" min / .509" max Head #2: .535" min / .545" max Allowing for .050" safety margin, and using the minimum clearance for each head, max safe valve lift on the two heads would be .456" for head #1 , and .485" on head #2. Both of these heads are 1997 castings, and I'm pretty sure they're off the same engine..

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Combustion chambers on the Vortec heads are listed at 64 cc, but GM tells us most heads are actually around 61 cc. This bottom-dollar cylinder head ($420 per pair, complete with valves and springs) proved to be a capable performer, producing 376 hp at 5,600 rpm. The rest of the ZZ4 remained as-delivered..

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Max Valve Lift as delivered is 0.475 in. and anything above requires machining of the valve guide bosses and checking valve seal-to-valve spring retainer clearance. Chevrolet Performance Vortec Cylinder Heads. Chevrolet Performance cast iron Vortec cylinder heads will fit 1958 and later small block Chevy engines, and offer a 20 to 40 hp.

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Assembled cylinder heads use 2.020 in. intake/1.600 in. exhaust valves, valve springs with .575 in. max lift for hydraulic flat tappet camshafts or .500 in. max lift for hydraulic roller camshafts, 3/8 in. screw-in studs, and guide plates..

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Aug 13, 2004 · Stock Vortec head kits - features stock out of the box Vortec heads that are good for about 0.450" lift. Upgraded Vortec head kits - features our high performance Z28 valve springs with light weight LT4 retianers, good for about 0.550" lift with a hydraulic camshaft..

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 · Narrow body self-aligning roller rockers run between $100-$150, just the same as regular roller rockers. If you run them then you won't need guide plates and they will fit under stock valve covers. There is no reason to go above .525.

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Seals which are not fully seated will reduce maximum lift capacity. OE GM Vortec heads normally use: 11/32" X .552" seals. (.552"-.555") Be aware some aftermarket heads (such as engine-quest) have different guide diameters. If you have aftermarket iron heads, it is advised to measure the guide diameters in advance..

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Factory stock Vortecs have serious lift limitations but you can fix it with a few simple changes. Springs, valve locks and seals all need to be changed and then you can run .470-.480" lift. The stock rockers don't have long slots either, so be sure they don't hit the studs at full lift.

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All build up with Vortec heads must have had the upgraded springs ect. since they used cams with lift in excess of the max .450. My question is really whether the stock <b>Vortec</b> <b>heads</b> with a cam lift under .450 will make 300-<b>350</b> HP with 9.5 CR, RPM Performer intake, Quadrajet carb and block hugger headers.

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All build up with Vortec heads must have had the upgraded springs ect. since they used cams with lift in excess of the max .450. My question is really whether the stock Vortec heads with a cam lift under .450 will make 300-350 HP with 9.5 CR, RPM Performer intake, Quadrajet carb and block hugger headers.

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