AFR 260cc LS3 Mongoose Cylinder Heads - Assembled
AFR 260cc LS3 Mongoose Cylinder Heads - Assembled
Regular price
$3,095.95
Regular price
Sale price
$3,095.95
Unit price
per
Tax included.
Shipping calculated at checkout.
Couldn't load pickup availability
AFR 260cc LS3 Mongoose Cylinder Heads - Assembled
AFR’s 260cc LS3 "Mongoose" heads are built to push your GM 6.2L LS platform to its limits, delivering the ultimate in airflow and power. Ideal for aggressive street or track builds up to 454 CI, these heads feature fully CNC ported intake and exhaust ports and combustion chambers for maximum efficiency and flow. They’re crafted from high-quality A356 aluminum and equipped with titanium retainers and top-grade components. Plus, they’re 50-state legal on 2007-2016 emission-controlled GM 6.2L LS engines.
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
- Max RPM: 7000
Recommended Components
- Intake Port Gasket: Factory GM or Aftermarket
- Rockers: OEM with trunion upgrade or Yella Terra 6733 (with 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 (2004 & later) or ARP #234-4316 (pre-2004), AFR #6335
- Suggested Manifold: FAST 92mm or 102mm
- Spark Plug Starting Range: NGK TR55
DETAILED INFO
DETAILED INFO
