Streetmaster to Airgap

How much power can a 302 head make?

Well, on the same 318 short block, with the same cam, headers, intake, carb, etc...... with the CR between the heads equalized....... the 302’s make 40hp less that some equally prepared 596’s.

Is it fair to say that that 125 cc intake port head was only down 20 cfm on that 160 cc port to only show a 40 HP difference?