Material: A356 Aluminium
Chamber Chamber: 82cc
Intake Port Volume: 220cc
Intake Port Dimension: 2.30" x 1.18"
Exhaust Port Volume: 74cc
Exhaust Port Dimension: 1.715" H x 1.25" W
Spark Plug Location: OEM
Intake Valve Diameter: 2.14"
Exhaust Valve Diameter: 1.81"
Valve Stem Diameter: 11/32"
Valve Spring Pocket I.D.: 1.705"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .530" (.560" at base)
Rocker Stud Thread Size: OE Stock
Valve Angle: 15°
Deck Thickness: .625"
Valve Spring Specifications
Installed Height: 1.850"
Installed Pressure: 125lbs
Open Pressure: 310lbs @ 500"
Maximum Lift: .600" @ 1.260"
Coil Bind: 1.150"
Spring Outside Diameter: 1.550"
Spring Inside Diameter: 1.140"
Spring Free Length: 2.310"
Valve Spring Retainer Outside Diameter: 1.500"
Valve Spring Inside Diameter: 0.415"
Valve Spring Retainer Step 1: 1.120"
Valve Spring Retainer Step 2: 0.640"
Valve Spring Locator Outside Diameter: 1.700"
Valve Spring Locator Inside Diameter: 1.550"
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.