Originally Posted by 377paul
Are you sure you want to do this? Is the bottom end stock? Depending on which intake manifold, heads, headers, carb CFM, etc., you could make up to 460 HP at 6000 RPM with the XE274H cam. This sounds like shrapnel time to me if you don't go with a good crank, rods and pistons!
Look at some of the 383 engine kits on line to get and idea of the possibilities.
This motor will peak out before 6000rpm. There is no reason to rev it higher.
its not nessess sary to abuse this motor with excessive rpm to make it perform.
5500 to 5800 is all thats nessessary for max performance.
Therefore the stock crank, rods and pistons will be fine. You'd need the XE284h-10 to make 460hp or very close to it. Most likely 450ish hp. You'll have a ton of usable torque. the Xe274 will make a little less all the way thru the band from 3000 up. The Xe284 needs a 11" "2800-3000 stall" converter.