Rectangle port Intake on Oval port Heads, I have heard this combonatation tends to work or vice versa... is there any reason that it does work or solid proof that it does? Like an A vs. B tests at the track, same everything except manifold switch... now my thoughts are it could be that the runners have or could have been filled to keep velocity up, and perhaps prevent reversion if that is an issue with bbc. I am very new to bbc and racing engines in general so if there is anyone who can enlighten me on this phenomenon or is it just one guy tried it and it worked for him? I always thought that any disruption in flow causes turbulence or unwanted /change in airflow at certain places in the port is detrimental to power output.... maybe the people it worked for made a round port exit out of the rect. port manifold.??
Thoughts, experience is what I am looking for.