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Here is several head designs GM sells
12480090 Bare C5R Racing Cylinder Head 355-T7 'as-cast' Aluminum racing head Professional porting and machining of combustion chambers required No seats or guides C5R rectangle port design requires aftermarket rectangle port intake manifolds Designed for 2.180/1.625 valves 11' valve angle Machined for 1.625 diameter valve springs & .500 guides Designed for big bore (4.100 min) LS7/C5R/LSX blocks 210cc 'as-cast' intake ports 70cc 'as-cast' exhaust ports, same as production LS6 30cc 'as-cast' combustion chambers All fasteners are metric Valve cover rails have O-ring groove for .125 O-ring Capable of over 800 horsepower!
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12564824 LS6 Cylinder Head Assembly Fits any 1997'2008 LS Family engine* 2.00 hollow stem intake, and 1.55 sodium filled exhaust valves .570 max valve lift 210cc 'cathedral port' intake ports 70cc D-shaped exhaust ports 65cc combustion chambers Bare head P/N 12564825 available separately
Heads P/N 12564824, P/N 88958665 and P/N 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
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For LS2
12576063 LS2 Cylinder Head Assembly Lower cost alternative to the LS6 head Fits any 1997'2008 LS family engine* 2.00 Solid stem intake, and 1.55 solid stem exhaust valves .570 max valve lift 210cc 'cathedral port' intake ports 70cc D-shaped exhaust ports 65cc combustion chambers Bare head P/N 12564825 available separately Upgrade the valves to LS6 hollow stem valves with P/N 17801930
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12578449 LS7 Cylinder Head Assembly 356-T6 aluminum head Fully CNC'd ports and chambers LS7 rectangle port design requires rectangle port intake manifold P/N 25534394, P/N 25534413 or P/N 12568976 Assembled with 2.20 titanium intake and 1.61 sodium filled exhaust valves 12' valve angle Designed for big bore LS7/C5R/LSX blocks (min 4.100 bore) 270cc CNC'd intake ports 85cc CNC'd exhaust ports 70cc CNC'd combustion chambers All fasteners are metric Capable of over 600 horsepower Bare head P/N 12578450 available separately
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25534428 LS7 Bare Unported Cylinder Head (not shown) 356-T6 aluminum head LS7 rectangle port design requires rectangle port intake manifold P/N 25534394, P/N 25534413 or P/N 12568976 Machined for 2.20/1.61 valves Designed for big bore LS7/C5R/LSX blocks (min 4.065 bore) Limited availability
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88958698 NEW CNC-Ported L92 Cylinder Head Assembly (not shown) CNC-ported performance head Fits any LS family engine with a bore of 4.00 or larger Uses stock 2.165 and 1.590 valves, springs and hardware Stock intake and exhaust port locations .510 max lift with stock springs 280cc intake port, 100cc D-shaped exhaust port, 68cc combustion chamber Not compatible with LS7 intake manifolds
Joined: Dec 2000 Posts: 5,908teamzr1 Owner - Pays the bills
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88958765 CNC-Ported LS2 Cylinder Head Assembly CNC-ported aluminum performance head Lower cost alternative to the CNC LS6 head Fits any 1997'2008 LS family engine* 2.00 solid stem intake, and 1.55 solid stem exhaust valves .570 max valve lift 250cc CNC'd 'cathedral port' intake ports 85cc CNC'd D-shaped exhaust ports 65cc CNC'd combustion chambers Upgrade the valves to LS6 hollow stem valves with P/N 17801930
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