Tools› Engine-Related

GForce

Engine Swap Block

$304.99

SKU: GF-EJ-DURAMAX-DIY

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The GForce 6.6L LML Duramax Engine Swap Block is a mock-up block designed for engine placement and accessory mounting. It features a patent-pending tab-and-slot system for accurate positioning and allows for the attachment of oil pan, motor mounts, headers, and intake. This durable steel construction resists welding heat and comes disassembled for easy shipping and storage.
Show original supplier description
The GForce 6.6L LML Duramax Engine Swap Block® Mock Up Block is a tool designed to accurately position a Duramax engine within a chassis during a build. Its patent-pending tab-and-slot design provides precise mounting locations for engine accessories and bolt-on components, including the oil pan, motor mounts, headers, and intake. Constructed from durable steel, this mock-up block is built to withstand welding heat, allowing for the fabrication of custom motor mounts directly on the block itself, unlike foam alternatives. It arrives disassembled, making it lightweight and convenient for shipping and storage. The tight tolerance slots and precision-formed returns ensure a rigid and accurate representation of the Duramax engine block, simplifying the engine placement process and eliminating the need for a crane. Included hardware supports exhaust, motor mounts, bellhousing, oil pan, and intake attachments. G Force Performance Products engineers these solutions to make installation easier and safer, saving time and money on your project.

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

Fitment Guaranteed

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Available on iOS & Android

Specifications

BrandGForce
Part NumberGF-EJ-DURAMAX-DIY
CategoryTools

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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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