Racing Flag

PARTS INTENDED FOR COMPETITION USE ONLY.
Click for more details.

Racing Flag

PARTS INTENDED FOR COMPETITION USE ONLY.
Click for more details.

SMALL-BLOCK SPLAYED-VALVE ALUMINUM RACE CYLINDER HEADS

12480146

ROUGH-MACHINED SPLAYED-VALVE ALUMINUM CYLINDER HEAD 

  • Main surfaces are machined, exhaust bolt pattern is machined
  • Head bolt and dowel holes, intake bolt holes, spark plug holes, and pushrod holes are not machined
  • Valve guides, valve seats, valve spring seats, and rocker stands are not machined
  • Valve locations and angles may be relocated
  • 240-cc “as-cast” intake ports
  • 78-cc “as-cast” exhaust ports
  • 45-cc “as-cast” combustion chambers

12480147

SEMI-MACHINED SPLAYED-VALVE ALUMINUM CYLINDER HEAD

  • Main surfaces are machined; exhaust bolt pattern, valve guides, and spark plug holes are machined
  • Head bolt holes, dowel holes, intake bolt holes, and pushrod holes are not machined
  • Valve seats, spring seats, and rocker stands are not machined
  • 240-cc “as-cast” intake ports
  • 78-cc “as-cast” exhaust ports
  • 45-cc “as-cast” combustion chambers
  • Same casting as P/N 12480146

24502517

SPLAYED-VALVE ALUMINUM CYLINDER HEAD 

  • Semi-machined aluminum race head
  • 240-cc “as-cast” intake ports
  • 78-cc “as-cast” exhaust ports
  • 45-cc “as-cast” combustion chambers
  • Same casting as P/N 12480146

12480153

SPLAYED-VALVE 4.500 BORE CENTER ALUMINUM CYLINDER HEAD

  • Semi-machined aluminum race head
  • Great for drag racing competition with dual carburetors
  • As-cast ports and combustion chambers for professional finishing
  • Use mid-deck block with 4.500" main bore machining
  • Special larger head-bolt pattern, 3/8" fasteners, 19 holes
  • 240-cc “as-cast” peanut intake ports
  • 78-cc “as-cast” peanut exhaust ports
  • 40-cc “as-cast” combustion chambers

88958684

SPLAYED-VALVE 4.500 BORE CENTER ALUMINUM CYLINDER HEAD CUBED

  • Great for drag racing competition with dual carburetors
  • 240-cc “as-cast” peanut intake ports
  • 78-cc “as-cast” peanut exhaust ports
  • Cubed aluminum race head
  • Bare head, no seats or guides

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Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance parts that are emissions-related may not meet U.S., Canadian, and state and provincial laws and regulations relating to motor-vehicle emissions. These parts are designed and intended for use in vehicles operated exclusively for competition: in racing or organized competition on courses separate from public streets or highways. Visit www.chevroletperformance.com/emissions for more details.