Dwayne is spot on with his comments. It's the .400" flow that always underachieves with these heads--best I've seen is 270cfm and that's still weak IMO. Usually I see around 350-357cfm peak at best no matter what size they are or who did them--in fact I had a set of CNC'd Victors that were claimed to go 390's-400's and they went 330 something. The height of the S.S. and the bowl shape won't allow much over 350cfm-they are a weird animal for sure.
@ PBR--How does your friend plan to put .750" lift into them when the install height is so short?
If I ever get/have to do another set I will mill the rocker stands off and get T&D to send me paired shaft rockers so I can fix the stupid short install height and put a longer valve and spring in it. J.Rob
