Engines and Components› Engines, Blocks and Components

Chevrolet

5.3L L33 Alloy Block Remanufactured Long Block Engine

$4,885.00

SKU: 300-353-03

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Professional / shop required

Description

The Chevrolet 5.3 LS Alloy Block engine, part number 300-353-03, is a re-manufactured gas engine designed for 2005-2007 GMC and Chevrolet trucks. This specific unit features an alloy block and a 24-lug crankshaft, identified by engine code L33 and VIN code B. Our comprehensive re-manufacturing process ensures the quality and longevity of this engine. Key steps include boring and honing all cylinders, precision surfacing the engine blocks which are never welded, and grinding and polishing the crankshafts, which are also never welded. The connecting rods are machined and re-sized, and the cylinder heads undergo rigorous inspection, pressure testing, and precision surfacing with a 3-angle valve seat cutting process. These cylinder heads are also never welded. Included with this re-manufactured engine is a complete gasket set and an installed block heater for added convenience and functionality. To ensure peak performance and reliability, every engine is subjected to a simulation-test (SIM) machine procedure. This testing verifies critical parameters such as oil pressure, compression, and the condition of all timing components. Additionally, all cylinder heads are inspected and pressure tested as part of the re-manufacturing process.

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

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Specifications

BrandChevrolet
Part Number300-353-03
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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