After seeing the success with the large bore gains, one of our 9 second Vs decided to pull the trigger on the medium bore heads and see what kind of magic will be worked. Stay tuned!

My head porter took the larger bore heads and reworked them for a client doing the 3.4L blower. Intake // Exhaust .100 76.2 // 53.8 .200 154.4 // 111.3 .300 234.7 // 162.2 .400 308.2 // 208.0 .500 359.3 // 236.6 .550 377.7 // 244.4 .600 388.0 // 250.9 .650 391.1 //...