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AFR LS1 LS2 LS6 15° Mongoose 245cc Cylinder Heads

$3,109.99 $2,773.99

Brand AFR
SKU: 1680

AFR’s, MONGOOSE, LS1 Cathedral Port cylinder heads are 100% 5-AXIS CNC ported and made with A356 aluminum. All heads come with high quality components, such as titanium retainers and Pac Racing Springs. Available in runner volumes from 210cc, 215cc, 230cc and 245cc. Component upgrades and different machining options are available to customize your AFR heads for your specific build. Minimum bore sizing is 3.900” to accommodate intake valve clearance.


Our max effort cathedral port head for the LSX platform is recommended for race applications or radical "Pro Street" builds with displacements up to 454 cubic inches, operating at or below 6800 RPM. Requires a minimum bore size of 4.000" to clear the supplied 2.165" intake valve. AFR heads are available bare (without parts), call our tech line for details.

245cc Aluminum LS1 Cylinder Heads
Part # Description Combustion Chamber
1680 Large Bore (4.000+) 65cc
1690 Large Bore (4.000+) 73cc


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 4.900" Overall Valve Length
AFR #7211
8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length
AFR #7228
PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, 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
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 2.100" O.A.L

*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.

Specifications & Features:
A356 Aluminum
Intake Port Volume
Intake Port Dimension
3.315"H x 1.145"W x 11/32 top 13/32 bottom
Intake Port Location
Exhaust Port Volume
Exhaust Port Dimension
1.495" H x 1.730" W
Exhaust Port Location
Combustion Chamber Size
65cc or 73cc
Valve Cover Bolt Pattern
Center Bolt
Valve Angle
Valve Spring Pocket Diameter
1.510" O.D
Max Valve Spring Pocket Machining
1.525" O.D
Deck Thickness
Minimum Bore Diameter
Flat Mill - 65cc chamber
.006" per cc 58cc Maximum
Flat Mill - 73cc chamber
.006" per cc 65cc Maximum
Minimum Cross Sectional Area
2.680 sq. in.
Spark Plug Dimensions
14mm x .750" w/Gasket Seat