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PARTS INTENDED FOR COMPETITION USE ONLY.
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SMALL-BLOCK VORTEC CYLINDER HEADS

12558060

CAST-IRON VORTEC CYLINDER HEAD ASSEMBLY

Cast-Iron Vortec Cylinder Head Assembly Chevy Performance

Cast-Iron Vortec Cylinder Head Detail Chevy Performance

Chevy Performance 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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Future GM Technicians Posing for a Picture with Dale Earnhardt Jr.

Bring Us Your Talent

Nobody knows automotive like Dale Earnhardt Jr. — so who better to share advice with aspiring auto techs?

Technician Stories

BLOCK-Module-Asset-BFTT-alt

The BLOCK

Visit TheBLOCK.com for a behind-the-scenes look at the world of Chevrolet Performance from an enthusiast's point of view.

Learn More

Four Chevrolet Camaro Sports Cars Parked on Display in a Showroom

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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.

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.