- Engines & Components
- Cylinder Heads
- AFR LS Chevy 260cc LS3 Mongoose Street Aluminum Cylinder Heads
Modeled After the GM LS7 Aluminum Head
AFR's 260cc LS3 "Mongoose" heads feature 12° valve angle, 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 cubic inches, operating up to 7000 RPM. Emissions legal for 2008 to 2015 vehicles under CARB #D-250-5.
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260cc LS3 Mongoose Street Cylinder Head Features:
- 100% CNC Ported Combustion Chambers
- 100% CNC Ported Exhaust Ports
- 100% CNC Ported Intake Ports
- Competition 5-angle Valve Job
- 260cc Intake Ports, Stock Location (2.610" Tall x 1.300" Wide x 7/16° Radius)
- 95cc Exhaust Port, Stock Location (1.540" Tall x 1.760" Wide)
- 69cc Combustion Chambers
- 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
- PAC Racing Valve Springs: 1.270'' OD Hydraulic Roller Dual Valve Spring, 155 lbs on seat, Max RPM 7000-7200
- 7° Titanium Retainers 1.245" O.D x 0.885" I.D x 0.655" I.D
- 7° Bead Lock Valve Keepers
- Viton Valve Seals, 0.600" O.D x 0.495" I.D
- Hardened Valve Spring O.D Locator, 1.380" O.D x 0.570" I.D
- Ductile Iron Intake Valve Seats
- Ductile Iron Exhaust Valve Seats
- 8mm Bronze Valve Guides, 0.502" O.D x 2.550" O.A.L
- Rocker Rail Stand
- CARB E.O. # D-250-5
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LS Blocks
AFR - Airflow Research 1845
AFR - Airflow Research 1845 260cc LS3 Mongoose Street Aluminum Cylinder Heads GM LS Chevy Block
$3,095.95
Estimated to ship direct from manufacturer on 05/01/24, pending manufacturer availability.
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$3,095.95
Estimated to ship direct from manufacturer on 05/01/24, pending manufacturer availability.
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AFR - Airflow Research 1846
AFR - Airflow Research 260cc LS3 Mongoose Street Aluminum Cylinder Heads LS Chevy Block
$2,672.53
Estimated to ship direct from manufacturer on 04/30/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,672.53
Estimated to ship direct from manufacturer on 04/30/24, pending manufacturer availability.
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Lowest Price Guarantee
LSX Blocks
AFR - Airflow Research 1840
AFR - Airflow Research 260cc LS3 Mongoose Street Aluminum Cylinder Heads LSX Chevy Block
$3,095.95
Estimated to ship direct from manufacturer on 04/30/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$3,095.95
Estimated to ship direct from manufacturer on 04/30/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
AFR - Airflow Research 1841
AFR - Airflow Research 260cc LS3 Mongoose Street Aluminum Cylinder Heads LSX Chevy Block
$2,672.53
Estimated to ship direct from manufacturer on 04/30/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee
$2,672.53
Estimated to ship direct from manufacturer on 04/30/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee