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NK Performance and Racing

AFR Mongoose 230CC LS1 CYLINDER HEADS

AFR Mongoose 230CC LS1 CYLINDER HEADS

Regular price $2,955.73 USD
Regular price Sale price $2,955.73 USD
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Chamber Volume
Exhaust Valve Upgrade

Our 230cc LS1 MONGOOSE cylinder heads are recommended for aggressive street or street/strip builds with displacements up to 427 cubic inches operating at or below 7200 RPM. Capable of flowing 328 CFM at 0.650" lift with a 4.000" bore size.


Included 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, 2.080" x 4.900" Overall Valve Length
8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length
PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, .650” maximum lift, Max RPM 7000-7200
7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D
7° Bead Lock Valve Keepers
Viton Valve Seals .600" O.D x .495" I.D
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D
Ductile Iron Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep
Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep
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.

230cc Small Bore Competition Flow Chart
  .200 .300 .400 .500 .550 .600
Int 157 224 272 311 320 324
Exh 129 183 225 244 248 252

Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 3.900", intake 3/4" radius plate exhaust, 1 3/4" curved pipe


Specifications & Features:
Material
A356 Aluminum
Intake Port Volume
230cc
Intake Port Dimension
3.250"H x 1.115"W x5/16 top 3/8 bottom
Intake Port Location
Stock
Exhaust Port Volume
86cc
Exhaust Port Dimension
1.385" H x 1.695" W
Exhaust Port Location
Stock
Combustion Chamber Size
62cc, 65cc, or 72cc
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
Deck Thickness
.750"
Minimum Bore Diameter
3.900"
Flat Mill - 62cc chamber
.006" per cc 58cc Maximum
Flat Mill - 72cc chamber
.006" per cc 67cc Maximum
Minimum Cross Sectional Area
2.425 sq. in.
Spark Plug Dimensions
14mm x .750" w/Tapered Seat
CARB Status: This product is not legal for sale or use on emission-controlled vehicles and intended for dedicated race vehicles only.
 
Recommended Components:
Intake Port Gasket
GM or FAST
Exhaust Port Gasket
GM#12558573
Head Gasket for Small Bore
Cometic 3.930 .040" or AFR #6846
Head Gasket for Large Bore
Cometic 4.160 .040" or AFR #6848
Head Bolts (97-03)
ARP 134-3609 or AFR #6330
Head Studs (97-03)
ARP 234-4110 or AFR #6331
Head Bolts (04+)
ARP 134-3610 or AFR #6334
Head Studs (04+)
ARP 234-4317 or AFR #6335
Head Bolt Washers, Manley
Suggested Manifold
FAST 90mm, 92mm, or 102mm
Spark Plug Starting Range
NGK TR55
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