Sbc pro comp heads dyno Same combo with nearly stock 041s will make 375 HP. 0 OR 5. Compared to Harland Sharp or Comp Cams they were a lot less. In addition, they have hardened seats and bronze valve guides. 050,242@o. - Hot Rod Magazine Whether you race Pro Stock, Super Comp, or just want to rebuild your old Chevy 350 small block, there are cylinder heads just for you! Performance cylinder heads enhance the airflow into your engine, giving you improved power and torque. check out our newest dyno results posted below using these heads on our bbc 572 pro-street engine. RUNS ON PREMIUM PUMP GAS. I have strict parameters that I have to work within, like 9. Check out results from the tests they executed on the 5 most popular small-block chevy cams. bgi lvksf ymev plcel uciadnhm tjy wwl vna ituqg zmvsdmy