hey i have a 92 rs with a 305 TBI 5-speed. But as they say no replacement for cubic displacment. Now i kno that all small block chevy are the same block, but i wanna drop a 400 in if all possilbe and what i mean by that is i wanna convert all the stuff of the 305 like all the fuel injection and stuff to the 350-400 but there probably gonna be carbed. So i've asked around and i've herd that all i have to do is swap everything that it will be a direct bolt on to the new motor i just have to get a bigger throttle body and injectors. Now the camaro i have has 185,000 miles so the motor has seen better days i mean it still runs great but the miles are gettin up there. Also the trans has the same so i'll have to rebuild it does anyone kno how much horse and ft. lbs. of torque the trans and the rear can handle? The rear is also stock and never redone so i was thinkin of building a stout rear to go with the stout motor and wondering if i would also have to upgrade the trans i'm assuming that i'm goin to have to upgrade. I wanna go natural asparated. I mean anyone can bolt on a turbo or supercharger. Which i might eventually do when i have the motor to the max without have to dump in to much money. So thanks a lot.

carl

 

Welcome aboard.

I won't "vote", just advise.

The 5-speed will not stand up to abusive driving behind a 350 or 400. Tame, "normal" driving, perhaps. Power adders - forget it.

400's are "externally balanced", meaning they require a different harmonic damper and flywheel than "regular" small block Chevys. Unless, of course, you spend some serious coin getting the crank internally balanced, which will solve a lot of other problems getting a 400 to work in a 3rd gen.

A 350 makes more economic sense. They are more readily available, and don't require too much special effort to install. There's no free lunch, though, as the LO3 exhaust is terrible, so figure on replacing all of it from heads to rear bumper. Increasing the engine and TB size will probably require PROM changes in order to get it to run to its potential. A 350 knock sensor and module should also be considered (GM didn't put 350 TBI's in 3rd gens, so figure on getting those from some other application).

You can make a stock 7.5" 10-bolt rear end handle a lot more power. Good gears, welding around the axle tubes, aluminum bearing-support cover will help a lot. Beyond that, you're looking at a custom 9" or 12-bolt.