Quote: whats the next head up from the edelbrock. is it worth upgrading the heads instead of cnc porting?
It depends upon how far you want to go. If you already own the RPM head, it can be hand ported to make 787 HP on a 451ci all motor, pump gas engine. To get that much from another head, you have to get the new head AND have it ported.
If you are looking for beyond 700 HP you should start with something other than the RPM head. If you already own them, 750 HP isn't beyond their capability.
