LS3/L92 Aluminum 6.2L Bare Block


  • Production aluminum block with iron sleeves
  • Forged powered metal 6-bolt main bearing caps
  • 4.065″ finished bore
  • Tested to over 500 horsepower


Shipping is free, but there is a delivery fee for residential addresses.

SKU: 12729604 Categories: , ,

LS3/L92 Aluminum 6.2L Bare Block

P/N 12673475

  • Direct replacement for:
    2009-2012 L9H
    2010-2012 L94
    2008-2013 LS3
    2010-2013 L99
    2007-2008 L92
  • Production aluminum block with iron sleeves
  • Production oiling system
  • Forged powered metal 6-bolt main bearing caps
  • 9.240″ deck height
  • Use only LS1, LS6, LS2, L92/LS3-style cylinder heads
  • 4.065″ finished bore (103.25mm)
  • Provisions for Active Fuel Management
  • Great for stroker cranks for even more cubes
  • Tested to over 500 horsepower!

Replaces P/N 12623967.

Weight 110 lbs

LS3/L92 Aluminum 6.2L Bare Block

12673475 Chevrolet Cylinder Block

The Chevrolet Performance LS-Series cylinder block is the foundation for the serious performance achievements that are driving a new generation of street and racing enthusiasts. Features include a deep-skirt casting (the block side extends below the crankshaft centerline); 6-bolt cross-bolted main caps, strong and lightweight aluminum alloy casting (most production blocks) and provisions for the latest in engine control management. The cam-in-block configuration brings inherent torque to every LS engine, with production-based blocks capable of supporting combinations of 500 horsepower or more. The Corvette ZR1’s unique 6.2L block, for example, supports the engine’s 638-horsepower rating. Chevrolet Performance’s high-performance iron LSX cylinder block supports more than 2,000 forced-induction horses!

Whether you’re building a mild street engine or an Outlaw racing engine, starting with a strong LS cylinder block brings the assurance that you’ll make the power you need with a durable foundation.

Replaces P/N 12623967.

GM Parts and Components carry a 12-month parts-only limited warranty unless otherwise noted.


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Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to