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12572808 - Production LQ9 / 6.0L Gen III Block - 3.98" Bore, 9.240" Deck, 2.56" Mains, 6 Bolt Main, Cast Iron Block

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

Availability: Item has been discontinued and is no longer available
Shipping: FREE 48 State Shipping


Gen III Cast iron block used in RPO LQ4 & LQ9 trucks, 1998-2006.The bore is 101.60mm or 4.0"Casting numbers: 12551364,12573581,12577184

The 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 productioin 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'sunique 6.2L block, for example, supports the engine's 638-horsepower rating. GM Performance Parts' high-performance inon LSX cylinder block supports more than 2000 forced-inductioni 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 amke the power you need with a durable foundation.

LQ9 Cast-Iron 6.0L Bare Block

  • Direct replacement for 1998-2004 LQ4 and LQ9 Truck and SUV 6.0L
  • Production cast-iron block
  • Production oiling system
  • 6-bolt iron main bearing caps
  • 9.240" deck height
  • Use only LS1, LS6, LS2 or L92/LS3-style cylinder heads
  • 4.00" finished bore (101.6mm)
  • No provision for Active Fuel Management
  • Great for stroker cranks for even more cubes
  • Tested to over 500 horsepower!

Application List



  • 12572808
  • 12572808
  • Chevrolet Performance Parts
  • Item has been discontinued and is no longer available
  • New


Shipping Information

  • Item Requires Shipping
  • 212.6 lbs.
  • W24.0000” x H19.8000” x L27.8000”
  • FREE 48 State Shipping

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