Page 150 of GM Performance Parts 2006 Catalog by GM Parts Direct

Fast Burn Cylinder Head (intake) A Fast Burn Cylinder Head (combustion chamber) A THE LT4 ALUMINUM HEAD Like the L98 Corvette head, the LT4 casting ushered in the next generation of high-performance GM performance small-blocks. The LT4 head has the latest in GM Performance Parts technologies with all of our high-end quality materials. This head can only be used on 1992-and-newer LT1 and LT4 engines with the reversecoolant flow design. It makes the perfect starting point for you to build a high horsepower version of one of these engines. 12363287 LT4 Aluminum Cylinder Head Assembly (not shown) Aluminum performance head Can only be used on 1992-newer LT1 and LT4 engines Completely assembled with 2.00"/1.55" valves 195 cc intake port 54.4 cc combustion chamber No heat riser Angled spark plugs (5/8" hex, 3/4" reach, tapered plugs) 1.48" Valve spring seat diameter Screw-in studs (3/8" top, 7/16" bottom) Use head gaskets with stainless steel fire rings Raised, machined rocker rails Exhaust ports are raised .100 , requires Fel-pro gasket #1470 Use rail type rockers P/N 10089648, or kit P/N 12370838 (rollers!) This head is assembled with the following components: 12555331 Intake Valves 10212808 Valve Spring Retainers 12551313 Exhaust Valves 10212810 Valve Stem Seals 12551483 Valve Springs 10212809 Valve Spring Shims 12552126 3/8" Rocker Studs 24503856 Valve Locks ALUMINUM FAST BURN HEADS When it comes time to own the street, this is the head for you! GM Performance Parts has brought together all of our new technologies to create the ultimate 23-degree small-block GM cylinder head. Fast Burn technology maximizes combustion of the air/fuel mixture, resulting in higher cylinder pressures and more power production. The combustion chamber (62 cc) is designed for flat top pistons, and the head requires no additional porting for optimum performance, so it provides maximum out-of-the-box performance. Recommended for any standard coolant flow 1955-2000 283-400 cubic inch small-block, the Fast Burn head helps us make 425 horsepower from our ZZ383 crate engine! A. 12464298 Aluminum Fast Burn Cylinder Head Assembly CNC-machined aluminum performance head Completely assembled with 2.00"/1.55" valves 210 cc intake port, roof raised .240" 78 cc D-shaped exhaust ports, raised .200", requires Fel-pro gasket #1470 (may require minor trimming) 62 cc combustion chamber, .400" thick deck (can be milled safely .060") No heat riser Angled spark plugs (5/8" hex, 3/4" reach, tapered plugs) 1.48" Valve spring seat diameter Use head gaskets with stainless steel fire rings Raised, machined rocker rails 0.530" max valve lift (without modifications) Screw-in studs, (3/8" top, 7/16" bottom) Dual bolt patterns for perimeter bolt and center bolt valve covers Dual bolt patterns for both Vortec and early model intake manifolds Use production intake gasket P/N 12529094 for Vortec intakes or dual bolt pattern intake gasket P/N 12497760 for either early model or Vortec design manifolds (Fel-pro #1289 and #1207 may be used) This head is assembled with the following components: 12555331 Intake Valves 10212808 Valve Spring Retainers 12551313 Exhaust Valves 10212810 Valve Stem Seals 12551483 Valve Springs 10212809 Valve Spring Shims 12552126 3/8" Rocker Studs 24503856 Valve Locks Fast Burn Cylinder Head (exhaust) A CHEVY SMALL-BLOCK V-8 148

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