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

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

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

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The BLOCK

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

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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?

View 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

Connect With Chevrolet Performance

Want to know the latest in Chevrolet Performance news and more? Connect with us via email and social media today.  

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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.