Cylinder Head, LS3 CNC Ported, Hollow Stem Valves, 0.650" Lift Dual Springs

Casting Number: 12595364 or 12582716
Valve Angle: 15-degree
Combustion Chamber: 70cc*
Intake Port Volume: 279cc*
Exhaust port Volume: 99cc*
Minimum Cylinder Bore Required: 4.000"

* Approximate, Numbers are within +/- 2ccs

Milling Information for Combustion Chamber Sizing:
 - Approximately 0.006 per 1-cc
For 68-cc Chamber Remove 0.012
For 65-cc Chamber Remove 0.030

Specifications:
Max Lift: 0.650"
Locks: 7-degree
Retainers: Titanium
Valves: Hollow Stem Valves
Flow Chart:
Flowed @ 28 H20