I would like to know what type of horsepower gains I would get if I was to upgrade my factory installed throttle body to a 58 mm throttle body. I have a '95 Camaro Z-28 with an LT-1 engine. The heads have been shaved 30 thousanths over.

Not much, maybe 5-7 hp I'd guess. Now if you had ported heads, cam, and headers the larger throttle bodies start to shine. Not real good bang for the buck on a stock engine.

Jody