[Walt Fricke]

'78: a small port 3.0 with the stock 9.3 CR and stock cam, but EFI/ITB would give pretty useful data. Especially if outfitted with a race, rather than street, exhaust. Even with a street exhaust it should be suggestive, as one can apply various exhaust factors. Because the question here is whether this kind of change can compensate (or how much it can compensate) for the restriction the small port represents. By my calculations, a 34mm port has about 3/4th the cross section of a 39mm port.

Dannobee - that 240 number is certainly useful - a 34mm head isn't going to flow that much. My understanding of the Euro SC head is that the port is 39mm. Anderson gives that figure. What sort of intake, if any, was on top of that head when flowed?

The only small port heads I have are the six on my engine, where they will stay until next they need to come off (which I hope isn't for a while).

Walt