CB Performance 044 Magnum+ head 90.5/92 Each (42x37, Dual Springs)Top Quality Aftermarket CB Performance 044 Magnum Plus Cylinder heads. These heads are supplied each, cut for 90. 5 92mm barrel and pistons with stainless steel 42mm inlet and 37mm exhaust valves. They feature improved port angles, 55% increased strength, tapered cooling fins, Chromoly valve retainers, swirl polished stainless steel valves, single groove 7 degree hardened super grip collets, heavy duty dual valve springs with chromoly retainers and