Sorry guys, I did not port them myself, I have no CNC machine, I just got a screamin deal on them or else I was going to get a set of the EQ or RHS magnum style heads, I even have some nice 1.7 roller rockers for the magnums but I got thease cheap enough to run them and save the rockers for somethin else. They look like miniture W2 ports. They were done for a high end super stock engine so port volumes are still original 302 head size, much smaller than a magnum.