Page 189 of GM Performance Parts 2006 Catalog by GM Parts Direct

CNC-Ported LS2 Cylinder Head Assembly (intake) B CNC-Ported LS2 Cylinder Head Assembly (chamber) B CNC-Ported LS2 Cylinder Head Assembly (exhaust) B 187 12576063 NEW LS2 Cylinder Head Assembly (not shown) Lower cost alternative to the LS6 CNC head Fits any 1997-2006 LS family engine* 2.00" Solid stem intake, and 1.55" solid stem exhaust valves .570" max valve lift 210 cc Cathedral port intake ports 70 cc D-shaped exhaust ports 65 cc combustion chambers Bare head p/n 12564825 available separately B. 88958765 NEW CNC-Ported LS2 Cylinder Head Assembly CNC-ported aluminum performance head Lower cost alternative to the CNC LS6 head Fits any 1997-2006 LS family engine* 2.00" Solid stem intake, and 1.55" solid stem exhaust valves .570" max valve lift 250 cc CNCd Cathedral port intake ports 85 cc CNCd D-shaped exhaust ports 65 cc CNCd combustion chambers Bare head p/n 12564825 available separately Heads 12576063 and 88958765 are assembled with the following components: 12563063 Intake Valves 10166344 Valve Spring Retainers 12563064 Exhaust Valves 12482063 Intake Valve Stem Seals 12586484 Valve Springs 12482062 Exhaust Valve Stem Seals 10166345 Valve Locks 24503856 Valve Locks LS2 LS6 Head Flow data: Lift 0.2 0.3 0.4 0.5 0.6 Stock intake 136 195 237 260 260 Stock exhaust 104 135 157 169 180 CNC intake 147 215 262 290 307 CNC exhaust 111 155 198 210 218 12582713 L76/L92 Cylinder Head Assembly Aluminum performance head Higher flow than standard LS heads Fits any LS family engine with 4.00" bore or larger 2.16" solid stem intake, and 1.59" solid stem exhaust valves As-cast rectangle port intake ports D-shaped exhaust ports As-cast combustion chambers Uses are head P/N 12582714 NEW NEW NEW

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