Material: A356 Aluminium
Chamber Chamber: 67cc
Intake Port Volume: 204cc
Intake Port Dimension: 2.22" x 1.31"
Exhaust Port Volume: 70cc
Exhaust Port Dimension: 1.34" H x 1.39" W
Spark Plug Location: Straight
Intake Valve Diameter: 2.02"
Exhaust Valve Diameter: 1.60"
Valve Stem Diameter: 11/32"
Valve Spring Pocket I.D.: 1.49"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .530" (.570" at base)
Rocker Stud Thread Size: 7/16" x 14
Valve Angle: 23°
Deck Thickness: .625"
Valve Spring Specifications
Installed Height: 1.790"
Installed Pressure: 135lbs
Open Pressure: 290lbs @ 500"
Maximum Lift: .540" @ 1.250"
Coil Bind: 1.210"
Spring Outside Diameter: 1.450"
Spring Inside Diameter: 0.700"
Spring Free Length: 2.350"
Valve Spring Retainer Outside Diameter: 1.400"
Valve Spring Inside Diameter: 0.395"
Valve Spring Retainer Step 1: 1.060"
Valve Spring Retainer Step 2: 0.680"
Valve Spring Locator Outside Diameter: 1.560"
Valve Spring Locator Inside Diameter: 0.560"
Important Information:
IMPORTANT NOTICE:
We recommend to check installed spring seat pressure & open pressure before installing your cylinder headsto make sure the spring pressure is correct for your application.