NOTE: The 429-460 Race Cylinder Heads are for engine applications that need high port volume/C.F.M. These heads flow approximately 525 C.F.M. to as much as 600+ C.F.M. (on a certified super-flow 1020) after C&C porting. They are also equipped with 8 extra bolt/stud locations (uses same head bolt and exhaust bolt pattern as the “C” head).