vortec

SMALL-BLOCK VORTEC CYLINDER HEADS

12558060

CAST-IRON VORTEC CYLINDER HEAD ASSEMBLY

  • Completely assembled with 1.940"/1.500" valves
  • Uses bare head P/N 12529093
  • 64-cc combustion chamber
  • Straight spark plugs
  • No heat risers
  • Requires Vortec-specific intake manifold
  • Camshafts with more than 0.475" lift require machining valve guide bosses and checking valve seal to valve spring retainer clearance
  • Can be machined for 2.020"/1.600" valves
  • Rocker arm studs can be pinned or drilled and tapped to 3/8"
  • Valve spring seat diameter is 1.280"
  • Casting number 10239906 or 12558062

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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.

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  • Do not use summer-only tires in winter conditions, as it would adversely affect vehicle safety, performance and durability. Use only GM-approved tire and wheel combinations. Unapproved combinations may change the vehicle’s performance characteristics. For important tire and wheel information, go to my.chevrolet.com/learn/tires or see your dealer.

  • Requires available Performance Exhaust or Z51 Performance Package.

  • Requires available Performance Exhaust or Z51 Performance Package.

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  • The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. Click here to see all Chevrolet vehicles' destination freight charges.