AFR Mongoose 260CC LS3 CYLINDER HEAD
260cc LS3 Cylinder Head AFR’s 260cc LS3 "Mongoose" heads feature 100% CNC ported intake, exhaust and chambers using our advanced engineering and flow techniques to produce the ultimate Rectangle Port head available today. Featuring A356 aluminum castings, titanium retainers and the highest quality components, throughout. They’re designed for 4.000 or larger bore applications up to 454 CI, operating up to 7000 RPM. This product is street legal in 50 states from 2007 to 2016 emission controlled vehicles with a General Motors 6.2L LS engine. AFR heads are available bare (without parts), call our tech line for details. Basic Package 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, 2.165" x 5.200" Overall Valve Length AFR #7214 8mm Bead Lock Exhaust Valve, 1.600" x 5.205" Overall Valve Length AFR #7212 PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, .650 maximum lift, Max RPM 7000-7200 AFR #8019 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 2.200" O.D x 1.750" I.D x .375" Deep AFR #9060 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 2.550" O.A.L AFR #9053 Rocker Rail Stand AFR #6040 260cc Large Bore Competition Flow Chart .200 .300 .400 .500 .600 .650 .700 Int 159 234 293 336 366 377 384 Exh 112 158 207 235 248 251 255 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 260cc Intake Port Dimension 2.610"H x 1.300"W x 7/16° Radius Intake Port Location Stock Exhaust Port Volume 95cc Exhaust Port Dimension 1.540" H x 1.760" W Exhaust Port Location Stock Combustion Chamber Size 69cc Valve Cover Bolt Pattern Center Bolt Valve Angle 12° Valve Spring Pocket Diameter 1.490" O.D Max Valve Spring Pocket Machining 1.510" O.D Warning: Do not machine spring pad any deeper. Deck Thickness .750" Minimum Bore Diameter 4.000" Flat Mill - 65cc chamber .006" per cc 62cc Maximum Minimum Cross Sectional Area 2.875 sq. in. Spark Plug Dimensions 14mm x .750" w/ Tapered or Gasket Seat Carb EO# Recommended Components: Intake Port Gasket Factory GM or Aftermarket Recommend Rockers - OEM w/ trunion upgrade Yella Terra 6733 w/ 5132 Valve Cover gasket. Scorpion 1162 Exhaust Port Gasket GM #12558573 Head Gasket Cometic 4.160 Bore Size Head Bolts (04+), ARP 134-3610 AFR #6334 Head Studs (04+), 2004 & Later Blocks ARP #234-4317, Pre 2004 Blocks ARP #234-4316 AFR #6335 Head Bolt Washers, Manley AFR #6320 Suggested Manifold FAST 92mm or 102mm Spark Plug Starting Range NGK TR55 Pushrods: Longer than Stock (see instructions for details)