CB Performance 044 Magnum Head Dual Spring Complete - 94mm Each (40mm x 35.5mm)Top Quality Aftermarket CB Performance 044 Magnum Cylinder heads. These heads are supplied, cut for 94mm barrel and pistons with stainless steel 40mm inlet and 35. 5mm 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 12mm long reach