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Engines and Components› Crankshafts and Components

Oldsmobile

6.6L 403 Engine Crankshaft Kit

Name: 6.6L 403 Engine Crankshaft Kit
Brand: Oldsmobile
SKU: O6.0ACK

$499.99

SKU: O6.0ACK

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$100 Minimum Order

Non-Returnable Item

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Professional / shop required

Overview

The Oldsmobile O6.0ACK is a crankshaft kit designed for the 6.6L 403 engine produced from 1977-1979. These kits are compatible with engine blocks featuring #418882 or #556607 casting numbers.

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The Oldsmobile crankshaft kit provides a complete solution for rebuilding the 6.6L 403 engine found in 1977-1979 models. Each crankshaft is professionally cleaned, inspected, and ground on an Italian crankgrinder before being micro-polished for installation. This kit is designed specifically for engine blocks identified by casting numbers #418882 or #556607. Every kit includes the necessary rod and main bearings for assembly. These units are sold outright through the national program, meaning there is no core return required. Additional components, such as connecting rods or bearing guard, can be sourced separately if required for your specific build.

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	Oldsmobile
Part Number	O6.0ACK
Category	Engines and Components

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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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