AFR Mongoose LS3 Port 12 Degree 6 Bolt Complete CNC Heads

AFR Mongoose 260cc Rectangle Port Cylinder Heads
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

Features Of Your New AFR Mongoose 260cc Cylinder heads
- 12 degree valve angles;
- 69cc Chamber;
- Cast from A356 Aluminium;
- Accepts factory LS3 Rockers (Note requires AFR Stands);
- CNC ported combustion chambers;
- Port to valve seat blending (Bowl blending);

Flow Rating CFM Results
260cc Street Head 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

Your New AFR Cylinder Heads Package Includes
- AFR 260cc Mongoose Rectangle Port Cylinder Heads (Pair);
- 6 bolt cylinder heads;
- Complete 5-Axis CNC port & polish program;
- 8mm Bead Lock Intake Valve, 2.165" x 5.195" Overall Valve Length;
- 8mm Bead Lock Exhaust Valve, 1.600" x 5.200" Overall Valve Length;
- 8 mm Bronze Valve Guides .502" O.D x 2.550" O.A.L;
- PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, Max RPM 7000-7200;
- 7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D;
- 7° Bead Lock Valve Keepers;
- Viton Valve Seals .600" O.D x .495" I.D;
- Assembled;