Sale

GM /

6.0L Gen III Cast-Iron Engine Block

$2,955.84 $2,499.99 Save $455.85

SKU: 12733807

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The GM 12733807 is a 6.0L Gen III cast-iron engine block, serving as a robust foundation for high-performance engine builds. It is designed as a direct replacement for production LQ4 and LQ9 engines, offering the durability and strength required for demanding applications. Key features include a production cast-iron construction for exceptional durability, a production oiling system for reliable lubrication of critical components, and secure 6-bolt iron main bearing caps to ensure superior crankshaft stability, which is crucial for high-horsepower builds. The block has a 4.000" bore and a 9.240" deck height, providing flexibility for various piston and rod combinations. This engine block does not have provisions for Active Fuel Management, making it ideal for high-output performance engines. It is engineered to reliably support over 500 horsepower, positioning it as a go-to choice for enthusiasts aiming to maximize power output without compromising reliability. Whether constructing a street performance vehicle or a dedicated race machine, the GM 12733807 block offers a solid and dependable starting point.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandGM /
Part Number12733807
CategoryEngines and Components
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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