Head Specifications:
Material: A356 Aluminium
Chamber Chamber: 58cc
Intake Port Volume: 205cc
Intake Port Dimension: 2.13" x 1.28"
Exhaust Port Volume: 71cc
Exhaust Port Dimension: 1.40" H x 1.40" W
Exhaust Port Location: Raised .250"
Spark Plug Location: OEM
Intake Valve Diameter: 2.08"
Exhaust Valve Diameter: 1.60"
Valve Stem Diameter: 8mm
Valve Spring Pocket I.D.: 1.64"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .490" (.560"at base)
Rocker Stud Thread Size: 7/16" x 14
Valve Angle: 20°
Deck Thickness: .750"
Valve Spring Specifications:
Installed Height: 2.040"
Installed Pressure: 175lbs
Open Pressure: 425lbs @ 500"
Maximum Lift: .790" @ 1.250"
Coil Bind: 1.190"
Spring Outside Diameter: 1.565"
Spring Inside Diameter: 0.790"
Spring Free Length: 2.480"
Valve Spring Retainer Outside Diameter: 1.500"
Valve Spring Inside Diameter: 0.465"
Valve Spring Retainer Step 1: 1.120"
Valve Spring Retainer Step 2: 0.705"
Valve Spring Locator Outside Diameter: 1.615"
Valve Spring Locator Inside Diameter: 0.565"
Suggested Components
Head Gasket: Fel-Pro 1011-1
Intake Gasket (1.28 x 2.13 Port Size): Fel-Pro 1262
Exhaust Gasket (1.40 x 1.40 Port Size): Fel-Pro 1487
Head Bolts: ARP 154-3605 (7/16") or 154-3603
Installed Components
Intake Valves: 2.08" x 5.00" x 8mm, part no. AF59-3030
Exhaust Valves: 1.60" x 5.03" x 8mm, part no. AF59-3031
Valve Springs: 1.575" Dual spring
Valve Retainers: 10° 8mm
Valve Locks: 10° 8mm
Valve Seals: 8mm x .502" Viton
Rocker Arm Studs: 7/16"-14 x 7/16"-24, part no. AF59-3026
Push Rod Guide Plates: 5/16" Flat, part no. AF59-3027
IMPORTANT NOTICE: We recommend to check installed spring seat pressure & open pressure before installing your cylinder heads to make sure the spring pressure is correct for your application.
Note: Sold as a pair
GUIDE PLATES AND ROCKER STUDS NOT INCLUDED.
