Stock L98 heads vs. stock Vortec heads

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07-24-2007, 09:20 PM

heavrolet9894

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Stock L98 heads vs. stock Vortec heads

I have a stock 350 TPI L98 in a 88 Iroc. I just bought a 350 4-bolt main with stock vortech heads for a spare block. I was wondering if it would be worth the trouble to switch the heads and put on a vortech tpi manifold.

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07-24-2007, 09:53 PM

Kevin91Z

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Car: 1990 Pontiac Trans Am

Engine: 355 TPI siamesed runners

Transmission: Tremec T56

Axle/Gears: 12-Bolt 3.73

Re: Stock L98 heads vs. stock vortech heads

Sure, if you dont mind swapping heads while the engine is in the car. Its a lot more of a pain in the butt that way. I'd say it'd be worth at least 20 HP and probably 30.