All I'll add is a local guy built an engine with Hugh's ported Edelbrocks (not big mouths) and it didn't perform as expected so he called me to flow test his heads. I was busy at the time so another local Friend flow tested them for him. He was not happy at all especially after my Friend said he couldn't even correct the issues. He bought a set of BPE heads and I didn't hear the results but I expect to hear much better news.