AFR’s 210cc LS1 Enforcer Cylinder heads feature our Permanent Mold “As-Cast” Technology. These heads are a good pick for OEM engine operating below 6300 RPM. A356 aluminum/64cc chambers/15 degree/min bore 3.900″/spark plug NGKTR55/ ( This is for a pair of heads. ) 8mm stem diameter bead lock keepers 21-4n stainless steel Int/exh Valve 2.020″/ 1.600″ PAC Racing Spring 1.290″OD Hydraulic Roller Dual Valve Spring,140 lbs on seat, .600″lift, Max RPM 6500 7°Chrome Moly Retainers 1.245″ O.D x .885″ I.D x .655″ I.D 7°Bead Lock Valve Keepers Viton Valve Seals Hardened Valve Spring O.D Locator Special order 7-10 business days. Please e-mail with questions.
DEL-TRON PRODUCTS
