Brand: Airflow Research (AFR)
Manufacturer's Part Number: 1137NP
Part Type: Cylinder Heads
Product Line: AFR 245cc NPP SBC Eliminator Racing Cylinder Heads
Automotive Fittings Part Number: AFR-1137NP
Combustion Chamber Volume (cc): 70
Intake Runner Volume (cc): 245cc
Exhaust Runner Volume (cc): 80cc
Cylinder Head Style: Bare
Cylinder Head Material: Cast aluminum
Intake Port Shape: Rectangular
Intake Valve Diameter (in.): 2.125 in.
CNC-Machined Combustion Chamber: Yes
CNC-Machined Intake Runner: Yes
CNC-Machined Exhaust Runner: Yes
Combustion Chamber Style: Heart
Intake Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Location: Raised
Spark Plug Style: Angle
Intake Valves Included: No
Exhaust Valves Included: No
Exhaust Valve Diameter (in.): 1.600 in.
Valve Springs Included: No
Damper Spring Included: No
Retainers Included: No
Locks Included: No
Valve Stem Seals Included: No
Rocker Arm Studs Included: No
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: No
Valve Cover Mounting Style: Perimeter bolt
Accessory Bolt Holes Drilled: Yes
Intake Valve Angle: 23
Exhaust Valve Angle: 23
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seats Machined: Yes
Valve Seat Machine Style: 5-angle
Valve Seat Material: Ductile iron
Cylinder Head Color: Natural
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Remanufactured: No
Quantity: Sold as a pair.
Notes: Designed for large displacement small blocks. Requires shaft mount rocker system with 0.450 in. offset and 0.180 in. offset lifters or 0.550 in offset rocker arms with standard lifters. Exhaust port raised 0.250 in. over GM L98 head.
Description:
AFR 245cc NPP SBC Eliminator racing cylinder heads are their largest and most powerful 60/40 head for the small block Chevy. These competition-ported heads feature 100 percent CNC-machined intake runners, exhaust ports, and combustion chambers. With A356 aluminum castings and high-quality components throughout, these NPP—no pushrod pinch—units have extra machining for 3/8 in. pushrod clearance. AFR 245cc NPP SBC Eliminator heads are offered with stock or spread port exhaust, and steel or titanium retainers, as well as bare.