Cast Iron Vortec Cylinder Head Assembly

Brand: Chevrolet Performance

Part Number: 12558060

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$320.01

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 Part number 12558060 has an additional freight charge of $24.95 per item due to its large size and/or weight.




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Cast-Iron Vortec Cylinder Head Assembly

Vortec Cylinder Heads

An easy way to gain 20-40 horsepower on any 1955 and newer Small Block Chevrolet V8 (except later-style LT1/LT4 engines with reverse-flow cooling) is by installing a set of Vortec cylinder heads. GM value-priced cast-iron cylinder heads use modified combustion chambers and high velocity port technology to provide improved performance. A Vortec cylinder head significantly outflows non-Vortec service replacement cylinder heads and earlier OEM cast-iron heads. These cylinder heads are ideal for applications up to 350 horsepower, but they require Vortec-specific intake manifolds.

12558060 Chevrolet Cylinder Head

  • Completely assembled with 1.940"/1.500" valves 
  • Uses bare head 12529093
  • 64cc 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

This head is assembled with the following components:

  • 10241743 Intake Valves
  • 12550909 Exhaust valves
  • 10212811 Valve Springs
  • 24503856 Valve Locks
  • 10241744 Valve Spring Retainer
  • 10212810 Intake Seals
  • 12564852 Exhaust Seals

Additional Required Components:

  • 10105117 (2)      Head Gaskets or
  • 12557236 (2)     Head Gaskets
  • 10168525 (14)     Bolts
  • 10168526 (4)     Bolts
  • 10168527 (16)     Bolts
  • 19300749     Spark Plugs

Engine Application: 19258602, 19210009, 12499101, 19210007 and 19210008