LS1 230cc Mongoose Street Head

Sale: $2,675.94
Save: -3% off

230cc LSX "Mongoose" Street Head

The Ultimate Bolt-On Emission Legal Street/Strip Weapon

LSX 230cc Mongoose cylinder heads
Click to enlarge

AFR's 230cc LSX heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, Titanium retainers and high quality components throughout. Recommended for aggressive street or street/strip builds with displacements up to 427 cubic inches, operating up to 6500 RPM. Requires minimum 3.900 bore size for intake valve clearance. Legal for 2005 and older emissions controlled vehicles under CARB EO #D-250-4. Component upgrade and machining options are available to customize AFR Heads to your specific build, call email or chat for details. AFR PN: 1660


230cc Small Bore LSX Aluminum Cylinder Head Flow Chart

AFR 1660 test on 3.900 bore

230cc LS1 Cylinder Head Small Bore Flow Chart

230cc Large Bore LSX Aluminum Cylinder Head Flow Chart

AFR 1630 tested on 4.125 bore

230cc LS1 Cylinder Head Big Bore Flow Chart 

Included Components

100% CNC Ported Combustion Chambers

100% CNC Ported Exhaust Ports

100% CNC Ported Intake Ports

Competition 5-angle Valve Job

AFR #72088mm Bead Lock Intake Valve, 2.080" x 4.900" Overall Valve Length

AFR #72288mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length

AFR #8019PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, Max RPM 7000-7200

AFR #85127° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D

AFR #9007*7° Bead Lock Valve Keepers

AFR #6612Viton Valve Seals .600" O.D x .495" I.D

AFR #8042Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D

AFR #9059Ductile Iron Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep

AFR #9069Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep

AFR #90518 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 AluminumMaterial

230ccIntake Port Volume

3.250"H x 1.115"W x5/16 top 3/8 bottomIntake Port Dimension

StockIntake Port Location

86ccExhaust Port Volume

1.385" H x 1.695" WExhaust Port Dimension

StockExhaust Port Location

62cc, 65cc, or 72ccCombustion Chamber Size

Center BoltValve Cover Bolt Pattern

15°Valve Angle

1.510" O.DValve Spring Pocket Diameter

1.525" O.DMax Valve Spring Pocket Machining

.750"Deck Thickness

3.900"Minimum Bore Diameter

.006" per cc 58cc MaximumFlat Mill - 62cc chamber

.006" per cc 67cc MaximumFlat Mill - 72cc chamber

2.425 sq. in.Minimum Cross Sectional Area

14mm x .750" w/Gasket SeatSpark Plug Dimensions

D-250-4Carb EO#


Recommended Components:

GM or FASTIntake Port Gasket

GM#12558573Exhaust Port Gasket

AFR #6846Head Gasket, Cometic 3.930 .040"

AFR #6848Head Gasket for Large Bore, Cometic 4.125 .040"

AFR #6330Head Bolts (97-03), ARP 134-3609

AFR #6331Head Studs (97-03), ARP 234-4110

AFR #6334Head Bolts (04+), ARP 134-3610

AFR #6335Head Studs (04+), ARP 234-4317

AFR #6320Head Bolt Washers, Manley

FAST 90mm, 92mm, or 102mmSuggested Manifold

NGK TR55Spark Plug Starting Range

Add to Cart:

  • Model: AFR1660
  • Shipping Weight: 68lbs