Semi-Finished 15° Aluminum Racing Cylinder Head


  • Fully machined, semi-finished, no seats or guides
  • Made of 355-T7 aluminum
  • Great head for NHRA Comp-Eliminator, V-8 and 4-cylinder
  • Capable of over 900 horsepower


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SKU: 24502615 Category:

Semi-Finished 15″ Cylinder Head

P/N 24502615

– 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°
– 210cc “as-cast” intake ports
– 35-37cc “as-cast” combustion chamber
– Capable of over 900 horsepower
– Multi-NHRA world records

Aluminum Racing Head Technical Notes:

– Made of 355-T7 aluminum
– Extra-thick decks for angle milling or heavy flat milling
– Extra port material for professional porting
– Recommended for use with 4.000″ to 4.155″ cylinder bores
– Revised location angled spark plugs (14mm, 5/8″ hex, 3/4″ reach, gasketed plugs)
– Raised and revised location intake and exhaust ports for superior airflow above 0.600″ valve lift
– Modified valve angles (not production 23°)
– Longer-than-stock valves required
– Designed for aftermarket shaft-mount rocker systems
– Perimeter-bolt-pattern-type valve covers required
– Specific 18°/15° intake manifold bolt patterns
– Recommended intake manifolds: P/N 24502481 or 24502653 (with valley plate P/N 24502654)
– Intake manifold gasket P/N 10185007

15″ Aluminum Racing Cylinder Head

24592615 Chevrolet Cylinder Head


The same superior Chevrolet Performance technology that professional NASCAR and NHRA racers have used to win races for decades is available for you to use in your racecar. The Chevrolet Performance Aluminum Racing Cylinder Heads are part of an extensive family of high performance inline-valve heads, designed specifically for race-winning engines.

Chevrolet Performance Aluminum Racing Cylinder Heads start with castings designed with thicker decks and manifold flange areas. The combustion chambers are designed for competition and air passages are maximized for high-velocity airflow. These cylinder heads thrive on high compression and high rpm. Used in conjunction with optimized short-block, intake and valvetrain combos, these heads are part of an “instant-on” power plant ヨ the kind of engine that will put you in the winner’s circle.

Chevy Performance engineers dramatically altered the valve architecture to improve airflow and maximize efficiency. These aluminum racing cylinder heads are only available unported, so you must have them custom-ported to your specific requirements.

Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to