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AFR 245cc LS1 Mongoose CNC Ported 6-Bolt Cylinder Heads, 73cc Chambers, With Parts

AFR 1692
AFR's 245cc LS1 heads feature 100% CNC ported intake, exhaust & chambers, Titanium retainers and high quality components throughout. Recommended for aggressive street or street/strip builds with displacements up to 427 cubic inches, operating at or below 7200 RPM. Requires minimum 4.000 bore size for intake valve clearance. Component upgrade and machining options are available to customize AFR Heads to your specific build.
Shipping: FREE continental USA ground shipping on ALL AFR Cylinder Heads
Pricing: $3,161.00

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Description

Built for big-air LS combos, AFR’s 245cc heads leverage our new permanent-mold casting to deliver exceptional strength, repeatability, and port finish—ideal for high-rpm, big-cube, and power-adder builds. The 6-head-bolt configuration adds critical clamping force for superior gasket life and stability under sustained load, making it the go-to choice when you’re leaning on the tune.

Basic Package Components Part #
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
*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. *Notes
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 2.100" O.A.L AFR #9051

Specifications, Features, and Optional Supporting Components
Material A356 Aluminum
Intake Port Volume 245cc
Intake Port Dimension 3.315"H x 1.145"W x 11/32 top 13/32 bottom
Intake Port Location Stock
Exhaust Port Volume 88cc
Exhaust Port Dimension 1.495" H x 1.730" W
Exhaust Port Location Stock
Combustion Chamber Size 73cc
Valve Cover Bolt Pattern Center Bolt
Valve Angle 15°
Valve Spring Pocket Diameter 1.510" O.D
Max Valve Spring Pocket Machining 1.525" O.D
Minimum Bore Diameter
4.000"
Deck Thickness
.750"
Flat Mill - 65cc chamber .006" per cc 58cc Maximum
Minimum Cross Sectional Area 2.680 sq. in.
Spark Plug Dimensions
14mm x .750" w/Tapered Seat
Important: Do not port match you intake manifold to any Fel-Pro gasket as it does not precisely match AFR heads.
Note: Milling head deck will affect flow numbers.

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Shipping Information

  • Item Requires Shipping
  • 65.0 lbs.
  • W12.0000” x H12.0000” x L24.0000”
  • Free Basic Shipping
  • This item ships in its own box.
  • FREE continental USA ground shipping on ALL AFR Cylinder Heads
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  • 877-514-9494Mon - Fri 8:00 AM - 4:00 PM PST