| Brand: | AT Racing World | | Part Number: | FF281.1001 | | Part Type: | Cylinder Heads | | | | | Cylinder Head Style: | Assembled | | Cylinder Head Material: | Aluminum | | Cylinder Head Finish: | Natural | | Combustion Chamber Volume (cc): | 64 cc | | CNC-Machined Combustion Chamber: | No | | Intake Runner Volume (cc): | 195 cc | | Exhaust Runner Volume (cc): | n/a | | CNC-Machined Intake Runner: | No | | CNC-Machined Exhaust Runner: | No | | Intake Port Shape: | Square | | Intake Port Location: | Standard | | Exhaust Port Shape: | Square | | Exhaust Port Location: | Standard | | Spark Plug Style: | Straight | | Comp. Valve Job: | No | | Intake Valves Included: | Yes | | Intake Valve Diameter (in): | 2.020 in. | | Exhaust Valves Included: | Yes | | Exhaust Valve Diameter (in): | 1.600 in. | | Valve Springs Included: | Yes | | Maximum Valve Lift (in): | 0.650 in. | | Outside Diameter of Outer Spring (in): | 1.450 in. | | Damper Spring Included: | Yes | | Number of Springs Per Valve: | Dual | | Retainers Included: | Yes | | Retainer Material: | Chromoly steel | | Locks Included: | Yes | | Lock Style: | 7 degree | | Valve Stem Seals Included: | Yes | | Valve Stem Seal Style: | Positive stop | | Rocker Arm Studs Included: | No | | Rocker Arms Included: | No | | Rocker Arm Nuts Included: | No | | Guideplates Included: | No | | Valve Cover Mounting Style: | Center & Perimeter Bolt | | Accessory Bolt Holes Drilled: | Yes | | Intake Valve Angle: | 23 deg. | | Exhaust Valve Angle: | 23 deg. | | Valve Guides Included: | Yes | | Valve Guide Material: | Bronze | | Valve Seats Machined: | Yes | | Valve Seat Machine Style: | 3-angle | | Valve Seat Material: | Ductile iron | | Steam Holes Drilled: | No | | Oiling Style: | Through pushrod | | Machined for O-Ring: | No | | Heat Crossover: | No | | Quantity: | Sold as a pair. | | Calculator | Compression Calculator |
Assembly Specifications:
Max Lift: .610"
Coil Bind: 1.060"
Intake Install: 135lbs @ 1.8
Exhaust Install: 135lbs @ 1.8
Closed Seat Pressure: 135lbs
Open Seat Pressure: 300lbs | 
