Material: A356 Aluminium
Chamber Chamber: 68cc
Intake Port Volume: 213cc
Intake Port Dimension: 2.15" x 1.30"
Exhaust Port Volume: 82cc
Exhaust Port Dimension: 1.45" H x 1.50" W
Spark Plug Location: Angled
Intake Valve Diameter: 2.08"
Exhaust Valve Diameter: 1.60"
Valve Stem Diameter: 8mm
Valve Spring Pocket I.D.: 1.57"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .502" (.560" at base)
Rocker Stud Thread Size: 7/16" x 14
Valve Angle: 23°
Deck Thickness: .625"
Valve Spring Specifications
Installed Height: 1.990"
Installed Pressure: 195lbs
Open Pressure: 450lbs @ 500"
Maximum Lift: .750" @ 1.240"
Coil Bind: 1.180"
Spring Outside Diameter: 1.565"
Spring Inside Diameter: 0.795"
Spring Free Length: 1.470"
Valve Spring Retainer Outside Diameter: 1.500"
Valve Spring Inside Diameter: 0.475"
Valve Spring Retainer Step 1: 1.120"
Valve Spring Retainer Step 2: 0.705"
Valve Spring Locator Outside Diameter: 1.620"
Valve Spring Locator Inside Diameter: 0.565"
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.