If it was the other way around, lets just say your manifold had smaller ports than the head, then porting and blending the manifold flange into the size and shape of the head ports is worthwhile. Exhaust gas slamming into an abrupt lip hurts flow...
I'm trying to decide whether or not to port match my Fp exhaust manifold to my head.On the Fp manifold, the port openings are much bigger than the ports on my 1g head.
I'm unable to find a conclusive answer as to whether I should make the...