splayed valve aluminum

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 may not meet Federal Motor Vehicle Safety Standards and emissions regulations and should not be operated on public roads. Chevrolet Performance customers are responsible for ensuring their use of Chevrolet Performance complies with applicable federal, state, and local laws, regulations, and ordinances. Many parts intended for racing or other “off-highway” use are not designed or tested for crashworthiness or to meet the safety needs of the motoring public, and may adversely affect the original intended performance or handling characteristics of the vehicle. These parts are designed and intended to be used with experts supervising their installation and use, to help assure the proper and safe operation of the vehicle.