Page 151 of GM Performance Parts 2006 Catalog by GM Parts Direct

15 /18 Cylinder Head (intake) 15 /18 Cylinder Head (combustion chamber) LATE MODEL ALUMINUM SHORT TRACK AND NHRA COMP ELIMINATOR RACING HEADS No one knows more about making power than GM Performance Parts! Now, the same technology that dominates NASCAR and the NHRA is available to the general public for use in your Late Model Saturday night racecar or your serious drag car effort! Weve designed an entire family of high performance in-line valve cylinder heads that are ready to take you to the winners circle. These Heads come with thicker deck material, thicker manifold flange areas, powerful combustion chambers, high velocity air passages. Drag racers in NHRAs Competition Eliminator want big compression, lots of rpm, and a cylinder head that delivers maximum power at the crack of the throttle. Coupled with the correct valve train, intake, and short block, these Racing Heads are exactly what small displacement drag racers have been looking for. The GM Performance Parts engineers have dramatically altered the valve architecture in this head to improve airflow and maximize efficiency. Weve also left some of these heads unported, so that your favorite aluminum artist can go to work on them to perfect your given application. Buy a set of these heads from GM Performance Parts, and the only thing youll have to worry about is the driving! Aluminum Racing Head Technical Notes: 355-T7 Aluminum Competition cylinder heads Extra thick decks for angle milling or heavy flat milling Recommended for 4.000"-4.155" cylinder bore Extra material around ports for professional porting Revised location angled spark plugs, (14 mm, 5/8" hex, 3/4" reach, gasketed plugs) Raised revised location intake and exhaust ports for superior airflow above .600" valve lift Longer than stock valves required Modified valve angles (not production 23 Designed for aftermarket shaft-mount rocker systems Perimeter bolt pattern valve covers required Specific 18 /15 intake manifold bolt patterns Recommended intakes: P/N 24502481, P/N 24502487, P/N 24502579 or P/N 24502653 (with valley plate P/N 24502654) Intake manifold gasket P/N 10185007 24502580 Semi-Finished 18 Cylinder Head Fully machined, semi-finished, no seats or guides Non-CNC ports and combustion chamber are as-cast 60 cc as-cast combustion chambers Designed for up to 2.20"/1.625" valves 215 cc as-cast intake ports .080" extra material on deck face, and .055" on intake face 12370855 Semi-Finished, X-rayed 18 Cylinder Head Fully machined, semi-finished, no seats or guides X-ray inspected to assure quality Non-CNC ports and combustion chamber are as-cast 60 cc as-cast combustion chambers Designed for up to 2.20"/1.625" valves 215 cc as-cast intake port Based on P/N 24502580 cylinder head 24502615 Semi-Finished 15 Cylinder Head Fully machined, semi-finished, no seats or guides Non-CNC ported, ports and combustion chamber are as-cast Great head for NHRA Comp-Eliminator, both V-8 and 4-cylinder applications! Casting has been rolled 2 , Valve-guides are also tipped 1 210 cc as-cast intake ports 35-37 cc as-cast combustion chamber Capable of over 900 horsepower Multi-NHRA world records 15 /18 Cylinder Head (exhaust) 149

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