Racing Flag

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

Racing Flag

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

BIG-BLOCK SERVICE REPLACEMENT HEADS

12562925

BARE CAST-IRON GEN V AND GEN VI CYLINDER HEAD

Bare Cast-Iron Big Block Cylinder Head Chevy Performance
Big Block Engine Service Replacement Cylinder Heads
Service Replacement Cylinder Heads from Chevy Performance
  • Bare cast-iron head
  • 118-cc combustion chambers
  • 7/16" accessory bolt holes

12562926

BARE CAST-IRON GEN V AND GEN VI CYLINDER HEAD  

  • Bare cast-iron head
  • Machined for 2.180"/1.880" 3/8" stem valves
  • 118-cc combustion chambers
  • 3/8" accessory bolt holes (otherwise identical to P/N 12562920)

12562920

IRON GEN V AND GEN VI CYLINDER HEAD ASSEMBLY

  • Cast-iron head
  • Completely assembled with 2.180"/1.880" valves
  • 118-cc combustion chambers
  • Uses P/N 12562925 bare casting
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Mark Allen’s beautiful 1967 Camaro RS/SS is powered by an LT4 crate engine.

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A GM ASEP Technician Inspecting a Chevrolet vehicle

Bring Us Your Talent

GM ASEP technicians can earn their degree in as little as 2 years, kick-starting a fulfilling career in the automotive industry. The program aims to guide you every step of the way.

Learn More

Learn More
Mark Allen’s beautiful 1967 Camaro RS/SS is powered by an LT4 crate engine.

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

Learn More
Four Chevrolet Camaro Sports Cars Parked on Display in a Showroom

Connect With Chevrolet Performance

Connect with Chevy Performance.
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VISIT OUR BRANDS FOR YOUR OE NEEDS

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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.
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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.