AFR Mongoose 215CC LS1 CYLINDER HEADS

215cc LS1 Cylinder Head AFR's 215cc mongoose cylinder heads a recommended for moderate street or street/strip builds with displacements up to 408 cubic inches operating at or below 6500 RPM. This medium sized, high velocity torque monster flows 312 CFM @0.600" of lift. Included Components 100% CNC Ported Combustion Chambers 100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports Competition 5-angle Valve Job  8mm Bead Lock Intake Valve, 2.020” x 4.900" Overall Valve Length AFR #7207 8mm Bead Lock Exhaust Valve, 1.600” x 4.900" Overall Valve Length AFR #7228 PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring,140 lbs on seat, .600" maximum lift, Max RPM 6300-6500, less than 235* duration, upgraded spring #8019 recommended for higher RPM & larger cams AFR #8017 7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D AFR #8512 7° Bead Lock Valve Keepers AFR #9007* Viton Valve Seals .600" O.D x .495" I.D AFR #6612 Hardened Valve Spr