Springs For Mechanical Flat Tappet & Hydraulic Roller Cams Affordable maximum power head for competition and ultra high-performance street. 530-580 hp potential, out-of-the-box, for a cost effective, race-winning set-up. 64cc chambers yield about 12.5:1 compression with a 12cc domed piston in a 350 V8. Accepts standard 23° valvetrain hardware. Assembled, Head, Sold Each | Combustion chamber volume | 64cc | | Intake runner volume | 215cc | | Exhaust runner volume | 85cc | | Intake valve diameter | 2.08" | | Exhaust valve diameter | 1.60" | | Valve stem diameter | 11/32" | | Valve guides | Manganese bronze | | Deck thickness | 9/16" | | Valve spring diameter | 1.55" | | Valve spring maximum lift | .650" | | Rocker stud | 7/16" | | Guideplate | Hardened steel | | Pushrod diameter | 5/16" | | Valve angle | 23° | | Exhaust port location | Raised .300" | | Spark plug fitment | 14mm x 3/4 reach, gasket seat | | Made In | USA | |
