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Dart Machinery

LS NEXT2 Aluminum Engine Block 4.125" Bore

$8,199.99 $7,250.00 Save $949.99

SKU: DRT-31947211

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Overview

The Dart LS NEXT2 Chevy LS Gen III Aluminum Block is a high-performance engine block designed for automotive applications. It features a standard deck height of 9.240 inches and a bore diameter of 4.125 inches, with a maximum bore capability of 4.165 inches. The block is constructed from aluminum and utilizes a 4-bolt main cap style for enhanced strength.
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The Dart LS NEXT2 Chevy LS Gen III Aluminum Block is engineered for demanding automotive applications, offering a robust foundation for high-performance engine builds. It features a standard deck height of 9.240 inches and a 4.125-inch cylinder bore diameter, with the capability to be bored up to 4.165 inches to accommodate larger displacements. Key specifications include a 4-bolt main cap configuration with included steel main caps and fasteners, ensuring maximum stability and reliability under high stress. The block is machined for counterweighted crankshafts and 1/2-inch head studs, further enhancing its performance potential. It is designed with a 1-piece rear main seal style and standard camshaft location. While the block is sold individually, it does not come with finished cylinder bores, cam bearings, or freeze plugs, allowing for custom tailoring to specific build requirements. This engine block is an ideal choice for enthusiasts and racers focused on building powerful and reliable LS engines. Its robust construction and design flexibility make it suitable for a wide range of performance applications, including hot rodding, drag racing, circle track, off-road, and marine use. The LS NEXT2 Aluminum Engine Block (Skirted) offers an upgrade path for those seeking enhanced performance and durability from their Chevy LS engine.

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

BrandDart Machinery
Part NumberDRT-31947211
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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