You
You have a lot of knowledge and experience with the sbm's, but 12.8 with nothing other than heads and 3.23 gear's. What cam did you run? What are ootb heads?
- cam is smaller than a stock 340 cam. Intake - .427/204 @ 050. Exhaust .455/and I "thinks" 212 @ 050.
- OOTB = out of the box.