We just ran a 438 inch low deck motor with 75 cc Edelbrock RPM heads and it looked to me like the heads wouldn't flow as much as the "classic" RPM heads. The power numbers were down a bit too. The flow numbers on the Edelbrock website are identical, but it didn't look to me like the 75cc casting would flow as well. Your post is the first set of numbers I've seen though.
Andy, were those the 75cc "RPM" heads or the "E STREET" heads?
If they were the RPM heads, were the chambers machined or as cast?
