Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
can i just put vortec heads on a 383 or do i have to machine anything
They will bolt on to your block, but you will still have the same valve-lift limit (around 0.460") of the Vortec head unless that is corrected, and due to the relatively small CSA of the Vortec intake port you may be a little RPM limited (power wise) on a 383. It's not bad for street driving, but for best track results some careful porting would be in order.