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Engines and Components› Engines, Blocks and Components

ATK ENGINES

DART LS 441CI SHORT BLOCK

Name: DART LS 441CI SHORT BLOCK
Brand: ATK ENGINES
SKU: A040 SP100
Price: 7654.32 USD
Availability: InStock

$7,654.32

SKU: A040 SP100

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Overview

The ATK SP100 is a Dart SHP LS Next 441CI Short Block designed for custom builds requiring a large cubic inch short block for natural aspirated power. It features a Dart SHP LS Next Cast Iron block with a 4.125” bore and 4.125” stroke, resulting in 441 CID displacement. The crankshaft is a Scat 4340 forged unit with a 58 tooth reluctor wheel, complemented by Scat 4340 forged H-beam 6.125” rods with ARP 2000 bolts. The engine utilizes 2618 forged +22cc dished moly skirt coated pistons and steel top rings with Napier 2nd ring sets. Compression ratios vary from 10.1:1 with 66cc heads to 9.8:1 with 70cc heads. Camshaft bearings, freeze plugs, and oil galley plugs are installed and sealed.

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DART LS 441CI SHORT BLOCK

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

Brand	ATK ENGINES
Part Number	A040 SP100

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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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