This is with a RPM, divider cut 1.5" and opening at the head, not fully matching the BBO port size. So 9.2 to 1 with this cam, a Crane 222/
[email protected] Hyd roller, lift is .555 on both, 110lsa
and a 750 Brawler and full length headers. The Victor made 20 HP more, peak at 6000 rpm. Mark wanted them to shrink the port entry size closer to stock for more mild street builds and the Trans Am 403 guys who can only run the Performer but the molds were already done. I think they should add material like the RPM intake at the port entry. The ports are 198cc as cast, was never the advertised 188cc intake port, SB chamber is for a 4" bore. The BBO head is now 218cc and for a 4.155" bore.