Air Flow Research LS1 Mongoose Cylinder Heads for Large-Bore 427 C.I. Engines CNC Ported 230cc w/ 62cc Chambers
Highlights
- Sold as a Pair
- Great for Street/Strip Builds
- CNC Ported Runners/Chambers
- Maximum RPM: 7000-7200 RPM
Air Flow Research LS1 Mongoose CNC-Ported 230cc Cylinder Heads with 62cc Chambers for Large-Bore 427 C.I. LS Engines.
Grab an aggressive upgrade through Air Flow Research! Their LS1 Mongoose 230cc cylinder heads (1610) deliver 328 CFM at 0.650" of lift. That makes this powerhouse excellent for menacing street and dual street-strip applications. Featuring a cathedral design, the ports boast incredible airflow consistency, making them ready to handle high RPMs. As long as you have a large-bore 427 C.I. LS engine, you’ll see the difference in no time.
Features and Benefits:
- Fully assembled pair of 230cc cylinder heads with 62cc chambers
- Ideal for 427 C.I.D. LS engines operating at or below 7200 RPM
- Recommended for moderate street or street/strip applications
- Made of A356 aluminum for strength, thermal stability, and reduced weight
- 100% CNC ported intake/exhaust runners and combustion chambers
- CNC porting maximizes airflow consistency and high-RPM performance
- Intake and exhaust ports are located in stock location
- Competition 5-angle valve job enhances airflow for high-RPM performance
- Uses PAC Racing hydraulic roller dual spring with 1.270" O.D.
230cc Flow Chart (CFM @ Valve Lift):
- .200” lift: 157 CFM intake, 129 CFM exhaust
- .300” lift: 224 CFM intake, 183 CFM exhaust
- .400” lift: 272 CFM intake, 225 CFM exhaust
- .500” lift: 311 CFM intake, 244 CFM exhaust
- .550” lift: 320 CFM intake, 248 CFM exhaust
- .600” lift: 324 CFM intake, 252 CFM exhaust
- .650” maximum lift
Specifications:
- Minimum bore diameter 3.900"
- Combustion chamber size: 62cc
- Valve angle: 15 degrees
- Port volume: 230cc intake / 86cc exhaust
- Intake port dimensions: 3.250" height x 1.115" width x 5/16” top and 3/8" bottom
- Exhaust port dimensions: 1.385" height x 1.695” width
- Intake valve: 8mm bead lock, 2.080" head diameter, 4.900" overall length
- Exhaust valve: 8mm bead lock, 1.600" head diameter, 4.900" overall length
- Ductile iron intake valve seats: 2.131" O.D. x 1.680" I.D. x .375" depth
- Ductile iron intake valve seats: 1.650" O.D. x 1.350" I.D. x .375" depth
- Bronze valve guides: 8mm, .502" O.D. x 2.100" O.A.L.
- Seat pressure: 155 lbs.
- Maximum RPM: 7000-7200 RPM
- Chromoly retainers: 7-degree, 1.245" O.D., .885" I.D., and .655" inner step diameter
- Valve keepers: 7-degree bead lock
- Viton valve seals: .600" O.D. and .495" I.D.
- Hardened valve spring locator: 1.380" O.D. and .570" I.D.
- Valve spring pocket diameter: 1.510" O.D.
- Maximum valve spring pocket machining: 1.525" O.D.
- Deck thickness 0.750"
- Flat milling rate: .006" removed per 1cc reduction
- Maximum combustion chamber volume after milling: 58cc
- Spark plug dimensions (with tapered seat): 14mm x .750"
Vehicle Fitment:
- 1960-1987 Chevy C10
- 1988-1998 Chevy/GMC C/K
*MUST be equipped with a 427 C.I. large-bore LS engine
Please Note: Do NOT machine the spring pad any deeper.
California Residents: Proposition 65 Warning
Related Categories: C10 Cylinder Heads, C10 Restomod Engine, C/K Engine, C/K Restomod
Only for use on pre-pollution controlled vehicles: This product can be used on vehicles that were manufactured before emissions control regulations were imposed. Pre-pollution vehicles are defined as:
- 1965 and older U.S. manufactured California certified vehicles
- 1967 and older U.S. manufactured federally certified vehicles
