Originally Posted by nosman
i arent planning on running 700bhp all the time, just with the gas at the strip. plan was, see what breaks and replace as necessarry, i only expest to see 300 - 400 bhp off gas.
My heads came with the engine, they are the smog heads with air injectors, however i have ported out the exhaust jets and done quite a lot of other porting in the valve throat area mainly. I intend getting some new or second hand alu heads when finances allow, and once i have shaken the car down.
i cant us turbos either way unfortunately, just dont have room due to where i put the engine!!
Thanks for all the tips though, but the engine build is about a year away yet at least!!
You can see 300 with those heads, 400 with some aftermarket heads.
Throwing 300 hp worth of juice on a 400 hp smallblock...... well that is asking, more like begging, pleading & praying for the thing to split.
You can add a main girdle, it will help out a bit.
Have you not thought of putting the turbos in front of the engine? If you get shorty style headers and turn them around so they point up and forward, you can mount the turbos there. Never Driven a 911 Turbo, heard they don't have too much lagg tho, so not sure what happened to your impreza.
Anyway, a nice stout 331 or 347 stroker should net you about 400 hp. But I'd go FI instead of Carburated.
Anyway, good luck with the whole thing.