Thefastguys

how much horsepower would you get by bolting up 243 stage 3 heads do a ls1 block. with a fast intake manifold and throttle body. along with full exhaust and intake. and tuned for 93 octane with bigger injectors.

whats the crank horsepower on estimate?

I was thinking about 500.

garygnu

it depends on the cam.a stage 3 ls head usually has big valves (2.08-1.60) that get close to the cylinder wall ,and this can hurt head flow.

Z Fury

iTrader: (1)

I don't see mention of a cam upgrade, so I'm guessing it won't do nearly as much as you're thinking.

TooLateVTEC

iTrader: (2)

Im thinkin less than 450.

No way in hell thats gonna make 500HP without a cam swap there, buck-o

A.R. Shale Targa

iTrader: (2)

I would argue that the right cam and tune w/ stock heads would do better
than killer heads/intake and that weak *** bumpstick...........
still not 500 but probably 460-470 all day @ flywheel........

Thefastguys

ok. just wondering, it was just a question for a friends car.