Engines and Components› Engines, Blocks and Components

ATK ENGINES

CHEVY 350 4 BOLT/1PC 325HP

$4,536.67

SKU: A040 HP291PM

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

ATK Engines; High Performance Crate Engine; HP291PM; Stage 2 Mid Dressed GM V8 350/330HP/375TQ; 4 Bolt Main. Special order, must be prepaid. Non-returnable. Non-refundable. Price includes $510.00 core charge. Shipped anywhere in the Continental United States for $175.00. 3 Year / Unlimited Mileage Warranty. Engine blocks magnafluxed, bored, precision-honed and mains line-honed. Camshaft bearings line-bored for accurate center-to-center clearance. Engine blocks and cylinder heads precision surfaced. Cylinder heads magnafluxed and machined for three-angle valve seats. Crankshafts stress-relieved, precision ground and micro-polished. Camshafts are precision ground or replaced with new camshafts. Each engine is tested (most are hot-run tested) for compression, oil pressure, oil leaks, engine noise and general operating condition before shipment. ATK believes that once you've experienced the quality of ATK products, you'll agree there is no better engine source than ATK from Classic Industries.
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CHEVY 350 4 BOLT/1PC 325HP

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

BrandATK ENGINES
Part NumberA040 HP291PM

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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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