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PARTS INTENDED FOR COMPETITION USE ONLY.
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BIG-BLOCK ZL1 ALUMINUM BLOCK

12370850

LS7 7.0L CORVETTE BARE BLOCK

Chevrolet Performance Big-Block ZL1 Aluminum Engine Block Lifter Valley View
Chevrolet Performance Big-Block ZL1 Aluminum Engine Block Top Front View
Chevrolet Performance Big-Block ZL1 Aluminum Engine Block Top Rear View
Chevrolet Performance Big-Block ZL1 Aluminum Engine Block 2-Piece Rear Main Seal View
Chevrolet Performance Big-Block ZL1 Aluminum Engine Block 4-Bolt Mains View
  • 4.240” finished bore
  • 4.300” max bore
  • 4.375” max stroke  
  • Use sleeve P/N 12480035
  • 2-piece rear main seal
  • Uses Mark IV front timing cover
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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

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

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

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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.