EngineQuest EQ-CH364CA Cylinder Head 69cc Rect. Port for GM Gen IV LS 6.0L 6.2LGM LS 6. 0L 6. 2L Cylinder Head 69cc Rect. Port Cylinder Head Assembled 2. 165 in 1. 590 in Valves 258 cc Intake 69 cc Chamber Aluminum GM LS Series Each All EQ cylinder heads outperform their competitors! Thicker deck for greater strength Improved design resists cracking Superior port finish for increased flow Water flow redesigned for greater thermal conductivity Hardened exhaust seats CNC machined guides and seats 25 point quality check on every