Material: A356 Aluminium
Chamber Chamber: 63cc
Intake Port Volume: 179cc
Intake Port Dimension: 2.28" x 1.16"
Exhaust Port Volume: 79cc
Exhaust Port Dimension: 1.75" H x 1.257" W
Spark Plug Location: Angled
Intake Valve Diameter: 2.02"
Exhaust Valve Diameter: 1.60"
Valve Stem Diameter: 11/32"
Valve Spring Pocket I.D.: 1.50"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .530" (.560" at base)
Rocker Stud Thread Size: OE Stock
Valve Angle: 18°
Deck Thickness: .625"
Valve Spring Specifications
Installed Height: 1.800"
Installed Pressure: 125lbs
Open Pressure: 340lbs @ 500"
Maximum Lift: .600" @ 1.260"
Coil Bind: 1.120"
Spring Outside Diameter: 1.450"
Spring Inside Diameter: 1.050"
Spring Free Length: 2.200"
Valve Spring Retainer Outside Diameter: 1.400"
Valve Spring Inside Diameter: 0.400"
Valve Spring Retainer Step 1: 1.050"
Valve Spring Retainer Step 2: 0.685"
Valve Spring Locator Outside Diameter: 1.500"
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.