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• Fully CNC Ported• 6-bolt-per-cylinder bolt pattern• LS7 style rectangle port design• Assembled with 2.200" titanium intake and 1.610" sodium-filled exhaust valves• 12° valve angle; minimum 4.100" bore• 70cc "as-cast" combustion chambers• Handles .650" lift with premium springs• Uses LS7 rocker arms/LS7 bolts• Uses P/N 19257879 bare head• 397 [email protected]" intake, 230 [email protected]" exhaust