Product images and videos 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.
Engines and Components› Engines, Blocks and Components
Hooker
Engine Mount Brackets 1978-1988 GM A, G-Body LS Swap Engine Mounting Brackets Use With Small Block Clamshell Mounts Hooker BlackHeart
SKU: H00I 12643HKR
Moderate — 2–4 hours
Overview
Constructed from steel with a zinc finish, these engine mount brackets are specifically designed for bolt-in compatibility with Hooker BlackHeart transmission swap components and are also compatible with the Holley LS swap oil pan 302-2 and accessory drive brackets. They provide an engineered 3 to 3.5 degree engine/transmission inclination angle for optimal U-joint working angles.
Show original supplier description
Part #: 12643HKR
These Hooker BlackHeart engine swap mounting brackets facilitate the installation of an GM LS motor into a 1978-88 A/G-Body as part of your LS swap project. This mounting bracket kit is part of the most comprehensively engineered system of mounting components, headers and exhaust systems available for this application. The entire Hooker BlackHeart swap system is designed to decrease your total swap installation effort and cost, while increasing the engineered quality of your vehicle and compatibility of these components with other popular aftermarket components.LS Oil Pan 302-2 can be used with these mounts** Please read the provided instructions thoroughly before attempting installation.TH350 Transmissions can reuse the factory transmission crossmember, but the slots in the center of the crossmember will need to be elongated in the forward direction.
Features:
- Specifically designed for bolt-in compatibility with the Hooker BlackHeart transmission swap components
- Most Durable Design Available
- Fully compatible with Holley LS swap oil pan 302-2 and accessory drive brackets.
- Mounting Hardware Included
- Provides an engineered 3 to 3.5 degree engine/transmission inclination angle that is critical to obtaining usable U-joint working angles (especially in lowered vehicles)
- Provides Finest Fit
- Mounting hardware included
Motor Mount - LS Swap - Bolt-On - Steel - Zinc Plated - Early Small Block Chevy Frame Mount to GM LS-Series - GM A-Body / G-Body 1978-88 - Kit
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
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
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Hooker |
| Part Number | H00I 12643HKR |
About MOTORMIA
Buy with Confidence
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.
View Full Return PolicyShipping
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.
View Full Shipping Policy