AFR 260cc LS3 Mongoose Cylinder Heads - Assembled
AFR 260cc LS3 Mongoose Cylinder Heads - Assembled
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AFR 260cc LS3 Mongoose Cylinder Heads - Assembled
Built for serious power, AFR’s 260cc LS3 "Mongoose" heads are the go-to choice for high-performance builds up to 454 cubic inches, capable of revving up to 7000 RPM. With 100% CNC ported intake, exhaust, and chambers, these heads are engineered from A356 aluminum and packed with premium components. Designed for 4.000" or larger bores, they’re a perfect match for aggressive street or track applications. What’s more, they’re 50-state street-legal on GM 6.2L LS engines from 2007 to 2016.
Basic Package Components
- 8mm Bead Lock Intake Valve: 2.165" x 5.200" O.A.L., AFR #7214
- 8mm Bead Lock Exhaust Valve: 1.600" x 5.205" O.A.L., AFR #7212
- PAC Racing Spring: 1.270" OD, 155 lbs. on seat, .650” max lift, AFR #8019
- 7° Titanium Retainers: 1.245" O.D x .885" I.D, AFR #8512
- Bead Lock Valve Keepers: AFR #9007
- Viton Valve Seals: .600" O.D x .495" I.D, AFR #6612
- Hardened Valve Spring 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
- 8mm Bronze Valve Guides: .502" O.D x 2.550" O.A.L, AFR #9053
- Rocker Rail Stand: AFR #6040
Flow Chart
| Lift (in.) | Intake Flow (CFM) | Exhaust Flow (CFM) |
|---|---|---|
| 0.200 | 159 | 112 |
| 0.300 | 234 | 158 |
| 0.400 | 293 | 207 |
| 0.500 | 336 | 235 |
| 0.600 | 366 | 248 |
| 0.650 | 377 | 251 |
| 0.700 | 384 | 255 |
Tested at 28" of water (pressure) on Superflow 1020. Bore Size: 4.060"
Specifications & Features
- Material: A356 Aluminum
- Intake Port Volume: 260cc
- Exhaust Port Volume: 95cc
- Combustion Chamber Size: 69cc
- Valve Angle: 12°
- Deck Thickness: .750"
- Minimum Bore Diameter: 4.000"
- Spark Plug: 14mm x .750" with Tapered or Gasket Seat
Recommended Components
- Intake Port Gasket: Factory GM or Aftermarket
- Rockers: OEM with trunion upgrade or Yella Terra 6733 (gasket 5132)
- Exhaust Port Gasket: GM #12558573
- Head Gasket: Cometic 4.160 Bore Size
- Head Bolts (04+): ARP 134-3610, AFR #6334
- Head Studs (04+): ARP #234-4317 (for 2004 & later), ARP #234-4316 (for pre-2004), AFR #6335
- Suggested Manifold: FAST 92mm or 102mm
- Spark Plug: NGK TR55
DETAILED INFO
DETAILED INFO
