Brand: At Racing World Part Number: FF281.1002 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): 190 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: Angle 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 Notes:Due to the large runner, an offset rocker arm will need to be used.
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