230cc LSX "Mongoose" Street Head

The Ultimate Bolt-On Emission Legal Street/Strip Weapon

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 here.

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 #7208 8mm Bead Lock Intake Valve, 2.080" x 4.900" Overall Valve Length
AFR #7228 8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length
AFR #8019 PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, Max RPM 7000-7200
AFR #8512 7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D
AFR #9007* 7° Bead Lock Valve Keepers
AFR #6612 Viton Valve Seals .600" O.D x .495" I.D
AFR #8042 Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D
AFR #9059 Ductile Iron Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep
AFR #9069 Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep
AFR #9051 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 Material
230cc Intake Port Volume
3.250"H x 1.115"W x5/16 top 3/8 bottom Intake Port Dimension
Stock Intake Port Location
86cc Exhaust Port Volume
1.385" H x 1.695" W Exhaust Port Dimension
Stock Exhaust Port Location
62cc, 65cc, or 72cc Combustion Chamber Size
Center Bolt Valve Cover Bolt Pattern
15° Valve Angle
1.510" O.D Valve Spring Pocket Diameter
1.525" O.D Max Valve Spring Pocket Machining
.750" Deck Thickness
3.900" Minimum Bore Diameter
.006" per cc 58cc Maximum Flat Mill - 62cc chamber
.006" per cc 67cc Maximum Flat Mill - 72cc chamber
2.425 sq. in. Minimum Cross Sectional Area
14mm x .750" w/Gasket Seat Spark Plug Dimensions
D-250-4 Carb EO#


Recommended Components:
GM or FAST Intake Port Gasket
GM#12558573 Exhaust Port Gasket
AFR #6846 Head Gasket, Cometic 3.930 .040"
AFR #6848 Head Gasket for Large Bore, Cometic 4.125 .040"
AFR #6330 Head Bolts (97-03), ARP 134-3609
AFR #6331 Head Studs (97-03), ARP 234-4110
AFR #6334 Head Bolts (04+), ARP 134-3610
AFR #6335 Head Studs (04+), ARP 234-4317
AFR #6320 Head Bolt Washers, Manley
FAST 90mm, 92mm, or 102mm Suggested Manifold
NGK TR55 Spark Plug Starting Range
 Model      Product Name   Price   Buy Now 
 1610   AFR LS1 230cc fully CNC ported, 62cc chambers, Big Bore, complete w/parts   AFR LS1 230cc fully CNC ported, 62cc chambers, Big Bore, complete w/parts   $2,598.00  Buy Now 
 1630   AFR LS1 230cc fully CNC ported, 72cc chambers, Big Bore, complete w/parts   AFR LS1 230cc fully CNC ported, 72cc chambers, Big Bore, complete w/parts   $2,598.00  Buy Now 
 1660   AFR LS1 230cc fully CNC ported, 65cc chambers, Small Bore, complete w/parts   AFR LS1 230cc fully CNC ported, 65cc chambers, Small Bore, complete w/parts   $2,598.00  Buy Now 
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Air Flow Research | 28611 W. Industry Drive | Valencia, CA 91355 | 661-257-8124

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