AFR’s 260cc LS3 “Mongoose” heads feature 100% CNC ported intake, exhaust and chambers using AFR 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.
Features
- 2.165"/1.600" stainless valves
- 69cc exhaust runners
- .650" Max Lift
- 260cc Intake Runners
- 69cc Combustion Chambers
- Cylinder Head Style:
- Assembled
- Cylinder Head Material:
- Cast aluminum
- Cylinder Head Finish:
- Natural
- CNC-Machined Combustion Chamber:
- Yes
- Combustion Chamber Volume (cc):
- 65cc
- Combustion Chamber Style:
- Heart
- CNC-Machined Intake Runner:
- Yes
- Intake Runner Volume (cc):
- 260cc
- Intake Port Shape:
- Rectangular
- Intake Port Location:
- Standard
- Intake Valve Angle:
- 12 degree
- CNC-Machined Exhaust Runner:
- Yes
- Exhaust Runner Volume (cc):
- 95cc
- Exhaust Port Shape:
- Oval
- Exhaust Port Location:
- Standard
- Exhaust Valve Angle:
- 12 degree
- Intake Valves Included:
- Yes
- Intake Valve Diameter (in.):
- 2.165 in.
- Exhaust Valves Included:
- Yes
- Exhaust Valve Diameter (in.):
- 1.600 in.
- Valve Type:
- Stainless
- Maximum Valve Lift (in.):
- 0.650 in.
- Valve Springs Included:
- Yes
- Valve Spring Type:
- Dual W/Damper
- Outside Diameter of Outer Spring (in.):
- 1.270 in.
- Valve Guides Included:
- Yes
- Valve Guide Material:
- Bronze
- Valve Seats Machined:
- Yes
- Valve Seat Material:
- Ductile iron
- Valve Seat Machine Style:
- 45 deagree seats with multiple angles
- Retainers Included:
- Yes
- Retainer Material:
- Titanium
- Valve Stem Seals Included:
- Yes
- Valve Stem Seal Style:
- Umbrella
- Locks Included:
- Yes
- Lock Style:
- 7 Degree
- Camshaft Style:
- Hydraulic roller
- Spark Plug Style:
- Angled
- Guideplates Included:
- No
- Guideplate Pushrod Size:
- N/A
- Rocker Arm Studs Included:
- No
- Rocker Arm Nut Thread Size:
- N/A
- Accessory Bolt Holes Drilled:
- Yes
- Valve Cover Mounting Style:
- Centerbolt
- Heat Crossover:
- No
- Steam Holes Drilled:
- No
- Oiling Style:
- Through pushrod
- Machined for O-Ring:
- No
- Quantity:
- Sold as a pair.
- Notes:
- For 4.0 in. and larger cylinder bore. Designed for six bolt blocks. Valve Spring Pressure, 155 lbs closed. Spark Plug Type 14mm Spark Plug, .690 Reach, 5/8 Hex
- CARB EO Number(s):
- D-250-5
- Emissions:
- California EO Approved
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen III/IV (LS-based engines)
- Engine Sizes:
- 6.0L/364-7.0L/427
- Years:
- 1999-2015
