Page 190 of GM Performance Parts 2006 Catalog by GM Parts Direct

Bare C5R Racing Cylinder Head (exhaust) A Bare C5R Racing Cylinder Head (intake) A Bare C5R Racing Cylinder Head (chamber) A CHEVY LS SERIES 188 The LS Family Aluminum Head Continued A. 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 rectangle port intake manifolds Designed for 2.180"/1.625" valves Valve angle revised to 11 Machined for 1.625" diameter valve springs .500" guides Designed for big bore LS7/C5R race block 210 cc as-cast intake ports 70 cc as-cast exhaust ports, same as production LS6 30 cc as-cast combustion chambers All fasteners are metric Valve cover rails have O-ring groove for .125" O-ring Capable of over 800 horsepower! 12578450 NEW LS7 Bare Cylinder Head (not Shown) 356-T6 Aluminum head Fully CNCd ports and chambers C5R/LS7 Rectangle port design requires rectangle port intake manifolds Machined for 2.20"/1.61" valves Valve angle revised to 12 Designed for big bore LS7/C5R race block (min 4.065" bore) 270 cc CNCd intake ports 85 cc CNCd exhaust ports 70 cc CNCd combustion chambers All fasteners are metric Capable of over 500 horsepower 12578449 NEW LS7 Cylinder Head Assembly (not shown) Based from 12578450 bare head Assembled with 2.20" Titanium Intake and 1.61" Sodium Filled Exhaust Valves Capable of over 500 horsepower This head is assembled with the following components: 12591644 Intake Valves 12596508 Valve Spring Retainers 12578455 Exhaust Valves 12482063 Intake Valve Stem Seals 12578457 Valve Springs 12482062 Exhaust Valve Stem Seals 10166345 Valve Locks 12596509 Intake Valve Lash Cap LS7 Head Flow data: Lift 0.1 0.2 0.3 0.4 0.5 0.55 0.6 0.7 Intake 71.0 145.0 222.0 271.0 315.0 332.0 348.0 352.0 Exhaust 60.0 120.0 159.0 192.0 207.0 214.0 219.0 221.0 17801930 NEW LS6 Hollow Stem Valve Kit (not shown) Kit of (4) intake and (4) exhaust valves originally for LS6 engines to drop right into your LS2 head. One kit services one head. LS SERIES CYLINDER HEADS Part Port Port Valve Chbr Int Exh Exh Plug Heat Rocker Number Description Mat'l Size Type Angle Cc's Vlv Vlv Port Type Riser Stud Notes 12480005 C5R 1st design Aluminum 210 Rec 11 38 2.18 1.63 Angled No Shaft As-cast, no seats/guides 12480090 C5R 2nd design Aluminum 210 Rec 11 30 2.18 1.63 Angled No Shaft As-cast, no seats/guides 88958622 CNC LS6 Aluminum 250 Cath 15 61.9 2.00 1.55 Angled No Bolt 11.2 compression 88958665 CNC LS6 Aluminum 250 Cath 15 65 2.00 1.55 Angled No Bolt 10.5 compression 12564824 Stock LS6 Aluminum 210 Cath 15 64.5 2.00 1.55 Angled No Bolt Hollow/sodium filled valves 12564825 Bare LS2 LS6 Aluminum 210 Cath 15 64.5 2.00 1.55 Angled No Bolt Bare LS2/LS6 12576063 Stock LS2 Aluminum 210 Cath 15 64.5 2.00 1.55 Angled No Bolt Solid stem valves 88958765 CNC LS2 Aluminum 250 Cath 15 64.5 2.00 1.55 Angled No Bolt Solid stem valves 12578450 Bare LS7 Aluminum 270 Rec 12 70 2.20 1.61 Angled No Bolt Bare LS7 12578449 Stock LS7 Aluminum 270 Rec 12 70 2.20 1.61 Angled No Bolt Titanium/sodium filled valves

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