When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Complete Aluminum Cylinder Heads Chevy LS3 250cc 64cc .625 Lift:
Brand: AT Racing World Part Number: FF281.1013 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): 250 cc Exhaust Runner Volume (cc): n/a CNC-Machined Intake Runner: No CNC-Machined Exhaust Runner: No Intake Port Shape: Rectangular Intake Port Location: Standard Exhaust Port Shape: Oval Exhaust Port Location: Standard Spark Plug Style: OEM Comp. Valve Job: No Intake Valves Included: Yes Intake Valve Diameter (in): 2.165 in. Exhaust Valves Included: Yes Exhaust Valve Diameter (in): 1.600 in. Valve Springs Included: Yes Maximum Valve Lift (in): 0.625 in. Outside Diameter of Outer Spring (in): 1.290 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: N/A Rocker Arms Included: No Rocker Arm Nuts Included: No Guideplates Included: N/A Valve Cover Mounting Style: Perimeter Bolt Accessory Bolt Holes Drilled: Yes Intake Valve Angle: 15 deg. Exhaust Valve Angle: 15 deg. Valve Guides Included: Yes Valve Guide Material: Steel Valve Seats Machined: Yes Valve Seat Machine Style: 3-angle Valve Seat Material: Ductile iron Steam Holes Drilled: N/A Oiling Style: Through pushrod Machined for O-Ring: No Heat Crossover: No Quantity: Sold as a pair. Calculator: Compression Calculator
Assembly Specifications Max Lift: .625" Coil Bind: 1.180" Intake Install: 140lbs @ 1.8 Exhaust Install: 140lbs @ 1.8 Open Seat Pressure: 335lbs. @ .600 lift