Technical Data

Casting
New Thickness/MeasuredAt: 4.387″
Minimum Thickness: 4.3600″
Warp Spec: .003″ Overall
Injector Tip Protrusion: .0580-.0720″
Comments:
* Check Valve Angles, Different Combinations Used For Select 1, 2 Or 3 – Intakes 20 & 30° And Exhausts Are 30 + 45°.

Valve
Intake:
Stem Diameter: .3775-.3793″
Angle: 19.5°
Margin: .114” Min
Recession: .000-.025” V/Rec

Exhaust:
Stem Diameter: .3775-.3793″
Angle: 29.5°
Margin : .114” Min
Recession: .000-.025” V/Rec

Valve Guide Information
Intake
Guide Height 1.2500-1.2900”
Guide Clearance: 0031”

Exhaust
Guide Height 1.2500-1.2900”
Guide Clearance: .0031″

Valve Seat Information
Intake:
Seat Width: .063-.125″
Seat Angle: 20°
Seat Inside Diameter: 1.9995-2.0005”
Seat Insert Bore Depth: .370-.375”

Exhaust:
Seat Width: .063-.125”
Seat Angle: 30°
Seat Inside Diameter: 1.9995-2.0005”
Seat Insert Bore Depth: .370-.375”

Valve Spring (Outer Or Single Spring)
Intake
Free Length: 3.460″
Installed Height: 2.810″
Open Test Press: 255# @ 2.240″
Close Test Press: 120# @ 2.810″
Exhaust
Free Length: 3.460”
Installed Height: 2.810”
Open Test Press: 255# @ 2.240”
Close Test Press: 120# @ 2.810”

Rocker Shaft
Shaft Diameter: 1.3710-1.3725″
Bore Diameter: 1.3735-1.3765″

Installation
Intake Valve Lash: .014″ Cold
Exhaust Valve Lash: .027″ Cold
Lash Adjustment Method: Adjusting Screw
Cyl Head Torque: 100, 220, 220 Ft/Lbs, + 90°