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Description
GM Chevrolet LS Gen III LM4 5.3 5.3L OEM Aluminum Bare Engine Block 12566910Condition: NEW NEW TAKE OFF The GM 12566910 5. 3L 325 cid Engine Block is a Gen III aluminum block used in Chevy and GM vehicles between 2003 and 2005. This lightweight aluminum block referred to as the LM4 features cross bolted mains and was originally designed for models like the 2004 Chevy SSR Trailblazer EXT GMC Envoy XL and Buick Rainier. Engineered for performance and durability the LM4 block provides an excellent foundation for high performance
Condition: NEW / NEW TAKE OFFThe GM 12566910 5.3L 325 cid Engine Block is a Gen III aluminum block used in Chevy and GM vehicles between 2003 and 2005. This lightweight aluminum block referred to as the LM4 features cross-bolted mains and was originally designed for models like the 2004 Chevy SSR Trailblazer EXT GMC Envoy XL and Buick Rainier. Engineered for performance and durability the LM4 block provides an excellent foundation for high-performance builds making it a popular choice among enthusiasts.
Part Number: 12566910
Manufacturer: GM
Weight: 200.0000 lbs
Additional Details:
Genuine OEM Parts
Please research/ensure fitment of part to your specific vehicle before purchasing. Returns because of non-fitment are accepted with a re-stocking fee, however customer is responsible for return shipping.
Shipping:
If shipping outside the contiguous 48 states is required, reach out to [email protected] to confirm shipping details.
About Us:
Custard Core Supply provides the highest quality of new, new take off, used, and core parts. We provide a variety of gas and diesel parts to our customers. Based in Dallas, TX Custard Core Supply has been in business since 1998. If you do not see a product you are looking for on our page, please reach out!
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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- To process your return/exchange, please contact us at [email protected]
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4.1 ★★★★★
Based on 2161 reviews
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Product Reviews
★★★★★ 5
Not too thick and durable and sturdy.
Color: Rustic Brown, Size: 24"W x 6.7"D, 3 Pack
Just before I purchased these 3 I bought 2 sets of 2 larger ones. The color is exactly what I was needing. They are packaged together so no scratches or damage. My husband (the installer) says they are easy enough to install.
They are perfect for a diy update, durable and hold plenty of weight for their size. Happy happy customer
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Good quality for the price
Color: Black, Size: 30"W x 6.7"D, 3 Pack, Color: Black, Size: 30"W x 6.7"D, 3 Pack
Seamless floating shelves that look and feel great. I opted to use different drywall anchors since I didn't trust the ones that came with the product. I have bad drywall and no studs where I was mounting so that doesn't fall back onto the product. The shelves are true to size and have held up great. The shelves themselves aren't too heavy so it leaves some room to add weight onto them. I used the 30in long shelf on the left and 24in long shelf on the right to create a nice corner shelf. There are additional screws on the bottom the keep the shelves from moving off the bracket.
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Reviewed in the United States on February 18, 2026
★★★★★ 3
Be careful
Color: Oak, Size: 24"W x 6.7"D, 3 Pack, Color: Oak, Size: 24"W x 6.7"D, 3 Pack
They are nice but flimsy, not flush on the wall scared they might fall
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Reviewed in the United States on January 27, 2026
★★★★★ 4
Beautiful for decor, not great for anything with heft.
Color: Oak, Size: 24"W x 6.7"D, 3 Pack, Color: Oak, Size: 24"W x 6.7"D, 3 Pack
They are easy to install and exactly as pictured. I find them to be lovely and uniform, and they can't with proper instructions and even extra pieces. I took away a star because they are described as "heavy duty" use, but the dowels used to mount the shelves are flimsy. Mine are mounted on combo of studs and drywall, the plates are secure and not going anywhere. The problem is the dowels themselves that fit into the corresponding holes of the shelf: they bend easily. I put three books and bookends on one shelf and watched it tip down. I did attach the bottom screws into the dowels I secure the shelf to the mounting brackets, but that's not going to save any items from sliding off as it bends down over time. I pulled the books immediately and decided to use these for decor only rather than any practical use. The stock photo suggesting lining these shelves with glass jars filled with flour, rice, and lentils is a terrible idea.
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Reviewed in the United States on August 12, 2025
★★★★★ 5
Great Looking Shelves
Color: Oak, Size: 24"W x 6.7"D, 3 Pack
We love the floating shelves. They were easy to install and matched our island perfectly.
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Reviewed in the United States on February 27, 2026
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