Air Flow Research LS1 Mongoose Cylinder Heads for Large-Bore 408 C.I. Engines CNC Ported 215cc w/ 65cc Chambers
Highlights
- Sold as a Pair
- Can Handle Street/Strip/Towing
- CNC Ported Runners/Chambers
- Maximum RPM: 6300-6500 RPM
Air Flow Research LS1 Mongoose CNC-Ported 215cc Cylinder Heads with 65cc Chambers for Large-Bore 408 C.I. LS Engines.
Grab a mid-sized, high-velocity, torque monster through Air Flow Research! Their LS1 Mongoose 215cc cylinder heads (1530) deliver 312 CFM at 0.600” of lift. That makes this powerhouse excellent for moderate 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 408 C.I. LS engine, you’ll see the difference in no time.
Features and Benefits:
- Fully assembled pair of 215cc cylinder heads with 65cc chambers
- Ideal for 408 C.I.D. LS engines operating at or below 6500 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 1.290" O.D.
215cc Flow Chart (CFM @ Valve Lift):
- .200” lift: 149 CFM intake, 111 CFM exhaust
- .300” lift: 215 CFM intake, 150 CFM exhaust
- .400” lift: 259 CFM intake, 209 CFM exhaust
- .500” lift: 293 CFM intake, 225 CFM exhaust
- .550” lift: 300 CFM intake, 230 CFM exhaust
- .600” lift: 303 CFM intake, 233 CFM exhaust
Specifications:
- Minimum bore diameter 3.900"
- Combustion chamber size: 65cc
- Valve angle: 15 degrees
- Port volume: 215cc intake / 85cc exhaust
- Intake port dimensions: 3.275" height x 1.120" width x 5/16” top and 3/8" bottom
- Exhaust port dimensions: 1.415" height x 1.710” width
- Intake valve: 8mm bead lock, 2.020" 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: 140 lbs.
- Maximum RPM: 6300-6500 RPM at less than 235-degree duration
- 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 408 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
