I have the zz4 GM crate engine in my camaro rated at 355 horsepower. I already have a new cat-back sysem and im getting headers this summer, but i still have the stock TBI unit and intake manifold on it. I was wondering what i should do for my induction, like getting the holley 670 and if it would be good to feed the engine, or if i would need to go carb or something else. And if i stay with TBI then if i should get a 2" manifold or go with a carb manifold, like the air-gap.

 

Check out the ALLGOHERE for the Holly 670, might answer a few things for ya...

Bruce (90RS305)

 

I would go with the holley 670 or the 454 with an carb intake. That is a lot of power for a 2bbl TBI set-up. With the stock TBI unit you are lucky if you have 250 right now. You will also need tuning and larger injectors sand fuel pump to get anywhere near the potential for that motor.

 

Go with the 670 or 454 tbi, get a nice custon tune, nad use a carb manifold. TBI can be made to perform well , it just takes a little time. \



I would definetly recoomed the AIR-GAP manifolds!!