Air Flow Research LS1 Mongoose Cylinder Heads for Large-Bore 427 C.I. Engines CNC Ported 230cc w/ 72cc 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 72cc Chambers for Large-Bore 427 C.I. LS Engines.
Step up your LS-powered build with LS1 Mongoose 230cc cylinder heads (1630)! They flow up to 328 CFM at 0.650" lift, making them a strong fit for street-strip combos. It’s thanks to the cathedral-style CNC porting, which provides consistent airflow and high-RPM capability. Air Flow Research also crafted them using A356 aluminum, making them exceptionally thermal stable. They work with large-bore 427 C.I. engines
Features and Benefits:
- Fully assembled pair of 230cc cylinder heads with 72cc 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: 72cc
- 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: 67cc
- 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, 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
