Chris,
They screwed up the ports on them from a decent working OOTB head that only needed a good valve job to make good power, to a POS that requires porting. Now they are no different than an Indy head, can't run them OOTB.... genius! I guess they don't evaluate the changes they make on what the end user needs to do. Better take the "bolt on, OOTB and go" sticker off the packaging! Fricken stupid.
Just as an example, the old BB victor head with a std port window and a good valve job could make 600hp pretty easy on a 500" without going insane on the camshaft. These new one, doubt they make 550 on the same engine. Flow at .500 lift is down over 20 cfm from the old port and the low lift numbers aren't good either.
They did do a nice revision on the chamber. Should have left the old port configuration with the new chamber and it would have been a solid improvement.
I think those flow numbers for the SB heads on the site are for RPM heads. Look close at the part number associated with that chart.
