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More than likely it was used on a small displacement, high RPM, extremely efficient engine. 360 cubic inches or less. Bigger is not always better... Not to bash the OP, but I would take the top port over the bottom one any day of the week, chances are it is a very highly efficient, high velocity port with every aspect of it set up for a max effort combination. The short side radius is a lot bigger than the bottom port for sure. The bore size wouldn't be as critical with that port it as long as it was 4" or more.


I am sorry but you just don't get it that top port has min cross section of 2.5 sq in this thing would not "RPM" on anything. High velocity port ?are we building dump trucks or race engines?
A PST 358. With w8 heads (CFE). Had min cross section of 3.2sq in.
A good NASCAR cup engine right now has min cross section of 3.8". I guess all the top engine builders have it wrong we need them darn high velocity ports.

I guess when I reworked Brian's small HVPs and took 20. Dur of duration out of the cam car picked up 1/2 sec and 8 mph.......

Oh and I am so glad that looking at port opening you can pick the "good port"

One of the reasons people that KNOW anything stopped posting here.....