Porting 351W heads
I have a 351W and would like to port the heads.
I can imagine that the intake flow gains much horses, because suction on the intake is vacuum from zero upto minus 0,xx bar.
However exhaust flow, flows from approx 8 bar combustion to zero. I can imagine that a 40 or 50 cfm improvement does wake any horses, and if just a few.
Anyone ever seen dyno's from intake tuning only and exhaust tuning only. So the realtion to the increased cfm of the port to the horses can be made.