Can anyone tell me CFM flow through the stock heads versus what you can get by opting them? I have a pair of 62 from a 69 400 and Pair of 16 from a 68 400? What does it usually cost to do a good job of porting and polishing versus getting a good set of aluminum after market heads?
86 Pontiac 2+2 69 Firebird Coupe(Under Construction) 69 Firebird 4 speed Vert Driveable but Under Construction 64 1/2 Mustang (Under Construction) 86 Z28 Convertible Weekend driver