http://www.edelbrock.com/automotive/...approved.shtml
http://www.edelbrock.com/automotive/...r-rpm-bb.shtml
"Combustion chamber volume: 75cc / 84cc / 88cc
Intake runner volume: 210cc
Exhaust runner volume: 70cc
Intake valve diameter: 2.140"
Exhaust valve diameter: 1.81"
Valve stem diameter: 11/32" "
I think someone said they weren't cutting the seats, so that would help with the standard 2.08"/1.74" valves. Then you need to ream the guides for 3/8" stems.