Engines and Components› Engines, Blocks and Components

Holley

GM LS/LT Engine Mount

$44.96

SKU: 71221018HKR

Special Order
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Hooker Headers 71221018HKR is a set of clamshell engine mounts designed for use with Holley polyurethane inserts. These mounts can also be used with polyurethane mounts from Energy Suspension and Prothane. They feature heavy-duty steel construction with a durable powdercoated finish and are designed with dowels for easy alignment, eliminating the need to drill rivets from existing shells.
Show original supplier description
The Hooker BlackHeart Heavy Duty LS Clamshell Engine Mount is engineered for GM LS and Gen 5 LT engines, offering a robust solution for engine mounting and swap applications. Constructed from heavy-duty 11-gauge steel with integrated reinforcement ribs, this mount is built for strength and longevity. It features a durable black powdercoat finish for resistance to the elements. Designed as a direct factory replacement for 4th generation F-Body vehicles, this clamshell mount ensures that critical drivetrain geometry is maintained, facilitating a smoother installation and optimal performance. Its two-piece, bolt-together design eliminates the need to drill out existing rivets, simplifying the installation process. The hardware kit required for assembly is included. This engine mount is intended for use with Hooker BlackHeart LS/LT Polyurethane Inserts, available separately in black (P/N 71221016HKR) or red (P/N 71221017HKR). Each vehicle requires two of these clamshell mounts; they are sold individually as one upper and one lower plate. The mount is compatible with Gen III/IV LS engines and is specifically noted for 4th Gen F-Body applications.

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

BrandHolley
Part Number71221018HKR
CategoryChassis Components

Videos

Hooker Blackheart Clamshell Mounts Make LS and LT Engine Swaps Easier than Ever

Hooker Blackheart Clamshell Mounts Make LS and LT Engine Swaps Easier than Ever
USING HOLLEY LS MOTOR MOUNTS FOR LS3/4L80E TRANS!

USING HOLLEY LS MOTOR MOUNTS FOR LS3/4L80E TRANS!

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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.

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