Page 188 of GM Performance Parts 2006 Catalog by GM Parts Direct

LS6 Cylinder Head Assembly (exhaust) A LS6 Cylinder Head Assembly (combustion chamber) A THE LS FAMILY ALUMINUM HEAD The LS Family of GM engines has continued our tradition of raising the power potential of the legendary small-block V-8. The LS6 cylinder head came as standard equipment on the amazing 405-horse ZO6 Corvette and the 2005 Corvette with the LS2 engine. These heads can be installed on any 1997-2005 LS Family of V-8 engines (except 4.8L 5.3L versions), and the GM Performance Parts engineers have even designed fully-CNC-ported versions to get your late model GM engine screaming right along. Our complete assemblies come with bee-hive valve springs and light weight hollow stem valves innovations that our competitors have had to copy to catch up to our designs. Weve already done the validation of these heads in competition in our show room stock C5R Corvette racecar, so you can be assured our LS6 race heads will live up to your demands. Aluminum LS Family Head Technical Notes: Aluminum 356-T6 High efficiency combustion chambers Symmetrical intake and exhaust ports (not mirrored like Gen I small blocks) Angled spark plugs, (14 mm, 5/8" hex, 3/4" reach, taper-seat plugs) 15 valve angles (except C5R and LS7) Bolt-down type rocker arms Center-bolt pattern valve covers required Will not work on Gen I or Gen II small-blocks A. 12564824 LS6 Cylinder Head Assembly Fits any 1997-2006 LS Family engine* 2.00" Hollow stem intake, and 1.55 sodium filled 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 88958665 CNC-Ported LS6 Cylinder Head Assembly CNC-ported aluminum performance head Fits any 1997-2006 LS family engine* 2.00" Hollow stem intake, and 1.55" sodium filled 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 88958622 CNC-Ported LS6 Racing Cylinder Head Assembly CNC-ported aluminum racing head 2.00" Hollow stem intake, and 1.55" sodium filled exhaust valves .570" max valve lift 250 cc CNCd Cathedral port intake ports 85 cc CNCd D-shaped exhaust ports 61.9 cc CNCd combustion chambers Bare head p/n 12564825 available separately Heads 12564824, 88958665 and 88958622 are assembled with the following components: 12565311 Intake Valves 10166344 Valve Spring Retainers 12565312 Exhaust Valves 12482063 Intake Valve Stem Seals 12586484 Valve Springs 12482062 Exhaust Valve Stem Seals 10166345 Valve Locks 24503856 Valve Locks * GMPP heads will not fit 4.8L 5.3L engines due to bore sizes that are too small. LS6 Cylinder Head Assembly (intake) A CHEVY LS SERIES 186

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