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For Sale LS3 CNC Ported Heads NEW


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I have a new set of gmpp LS3 821 casting CNC Ported Heads


$1100 new price



these come as shown with light weight valves and Z06 springs


and are 68cc


Valve Angle: 15-degree

Combustion Chamber: 70cc*

Intake Port Volume: 275cc*

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




Max Lift: 0.570"

V/Springs: Stock LS3/LS6

Locks: 7-degree

Retainers: Stock


Flow Chart:

Flowed @ 28 H20

Lift 0.100 0.200 0.300 0.400 0.500 0.600 0.650

Intake 70 153 225 280 324 350 358

Exhaust 52 118 180 201 217 230 236










Edited by BlownFogger540 (see edit history)
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