[hound dog]

Wilf,
From what I can find, the 4V Cleveland heads flow about 273 cfm at .600 lift. It would be easy for someone who knows what they're doing to massage a set of these heads to flow well in excess of 300 cfm at .600 intake lift. They should be easily the equal of aftermarket heads in flow capacity. However, other factors such as chamber design is a whole new subject. Anyone know what the Yates heads flow?
h dog