What HP gains can I expect from putting the Corvette aluminum heads on? What was the HP difference fromthe Corvette TPI and the Firebird one? I think that was the big differnece on the corvette. Thanks

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88 Formula 350
Upper and Lower SuperRam, 1000 CFM Accel Throttle Body, 24# Motorsport Injectors, Custom Burned PROM, Larger Gutted Mass Sensor, MSD 6a box, Flowmaster Muffler, Homemade Cold Air induction, TB Bypass, B&M shift Kit, 160* Thermostat

 

well they don't weigh as much, so thats a gain, but i don't know how much HP. but also, i think the vett had better exhaust manifolds. which probably helped alot.
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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16

[This message has been edited by breathment (edited October 07, 2001).]

 

When GM put the vette heads on the L98 in 86' the horsepower went from 230 to 240. The D-port heads intruduced in 88' are probably good for another 5hp over the round port, 86-87' heads.

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89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

Actually the Corvette L98 and the F-Body L98 were rated very similarly in horsepower and torque from 87-91. The Corvette L98 heads pretty much suck in stock form. But you can port them a lot better than the iron F-Body heads. Plus they are aluminum for lighter weight and you can have more compression. I'm using a ported set on my engine with nice results.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
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