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 Spring O.D Locator 1.380" O.D x .570" I.D AFR #8042 Ductile Iron Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep AFR #9059 Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep AFR #9069 8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L AFR #9051 *LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX. 215cc Competition Flow Chart   .200 .300 .400 .500 .550 .600 Int 149 215 259 293 300 303 Exh 111 150 209 225 230 233 Test conducted at 28" of water (pressure) on Superflow 1020Bore Size: 4.060", intake 3/4" radius plate exhaust, 1 3/4" curved pipe Specifications & Features: Material A356 Aluminum Intake Port Volume 215cc Intake Port Dimension 3.275"H x 1.120"W x5/16 top 3/8 bottom Intake Port Location Stock Exhaust Port Volume 85cc Exhaust Port Dimension 1.415" H x 1.710" W Exhaust Port Location Stock Combustion Chamber Size 65cc Valve Cover Bolt Pattern Center Bolt Valve Angle 15° Valve Spring Pocket Diameter 1.510" O.D Max Valve Spring Pocket Machining 1.525" O.D Deck Thickness .750" Minimum Bore Diameter 3.900" Flat Mill .006" per cc 58cc Maximum Minimum Cross Sectional Area 2.260 sq. in. Spark Plug Dimensions 14mm x .750" w/Gasket Seat CARB Status: This product is not legal for sale or use on emission-controlled vehicles and intended for dedicated race vehicles only.  Recommended Components: Intake Port Gasket GM or FAST Exhaust Port Gasket GM#12558573 Head Gasket Cometic 4.160 .040" or AFR #6848 Head Bolts (97-03) ARP 134-3609 or AFR #6330 Head Studs (97-03) ARP 234-4110 or AFR #6331 Head Bolts (04+) ARP 134-3610 or AFR #6334 Head Studs (04+) ARP 234-4317 or AFR #6335 Head Bolt Washers, Manley AFR #6320 Suggested Manifold FAST 90mm, 92mm, or 102mm Spark Plug Starting Range NGK TR55