Material: A356 Aluminium
Chamber Chamber: 58cc
Intake Port Volume: 185cc
Intake Port Dimension: 2.10" x 1.25"
Exhaust Port Volume: 58cc
Exhaust Port Dimension: 1.35" H x 1.35" W
Spark Plug Location: OEM
Intake Valve Diameter: 2.02"
Exhaust Valve Diameter: 1.60"
Valve Stem Diameter: 8mm
Valve Spring Pocket I.D.: 1.55"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .500" (.560" at base)
Rocker Stud Thread Size: 7/16" x 14
Valve Angle: 20°
Deck Thickness: .750"
Valve Spring Specifications
Installed Height: 1.840"
Installed Pressure: 125lbs
Open Pressure: 310lbs @ 500"
Maximum Lift: .680" @ 1.160"
Coil Bind: 1.070"
Spring Outside Diameter: 1.320"
Spring Inside Diameter: 0.675"
Spring Free Length: 2.300"
Valve Spring Retainer Outside Diameter: 1.250"
Valve Spring Inside Diameter: 0.410"
Valve Spring Retainer Step 1: 0.880"
Valve Spring Retainer Step 2: 0.650"
Valve Spring Locator Outside Diameter: 1.615"
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.