Simpson STD E.23 SFI-5 1-Piece Suit X-Large Blue/White 2-Layer 804461

Simpson STD E.23 SFI-5 1-Piece Suit X-Large Blue/White 2-Layer

Head Specifications

Material: A356 Aluminium
Chamber: 68cc
Intake Port Volume: 208cc
Intake Port Dimension: 2.08" x 1.49"
Exhaust Port Volume: 119cc
Exhaust Port Dimension: 1.61" H x 1.50" W
Exhaust Port Location: OEM
Spark Plug Location: OEM
Intake Valve Diameter: 2.10"
Exhaust Valve Diameter: 1.65"
Valve Stem Diameter: 11/32"
Valve Spring Pocket I.D.: 1.70"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: 0.560"
Rocker Stud Thread Size: 7/16" x 14
Valve Angle: 10
Deck Thickness: .470"

Valve Spring Specifications

Installed Height: 1.880"
Installed Pressure: 123lbs
Open Pressure: 280lbs @ 500"
Maximum Lift: .630" @ 1.160"
Coil Bind: 1.150"
Spring Outside Diameter: 1.550"
Spring Inside Diameter: 1.135"
Spring Free Length:2.300"
Valve Spring Retainer Outside Diameter: 1.495"
Valve Spring Retainer Step 1: 1.115"
Valve Spring Retainer Step 2: 0.640"
Valve Spring Locator Outside Diameter: 1.700"
Valve Spring Locator Inside Diameter: 1.530"