Hooker BlackHeart LS Swap Exhaust Manifolds

1982-2004 GM S-10/Sonoma LS Swap Exhaust Manifolds, 2.50 inch Outlet - Natural Cast Finish

Part # 71223026HKR Be the first to write a review
Estimated Ship Date: 04/28/2023
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This product is engineered to facilitate the installation of a later model, emissions friendly engine into a vintage / classic vehicle.

See Emissions Details
These Hooker BlackHeart cast iron exhaust manifolds are designed for 1982-2004 GM S10/Sonoma trucks with LS engines. They feature a 2.5 inch outlet, a natural cast finish and and are designed to be used with Hooker BlackHeart Engine Mounts (P/N 71221029HKR) and Transmission Crossmembers (P/N 71222020HKR, 71222018HKR, or 71222019HKR) for a trouble free install.


  • LS Swap Exhaust Manifolds for 1982-2004 GM S10/Sonoma, Designed as One Part of a Fully Engineered Swap System for an Easy Bolt-in Engine Swap
  • Eliminate the Installation Guesswork and Fitment Compatibility Issues that Can Be Common with Universal Engine Swap Components
  • Cast from Hi-Silicon-Moly Ductile Iron to Provide Durability and Corrosion Resistance
  • 304 Stainless Steel MLS Collector Gaskets, and Mating Flange Hardware Included
  • 2.5-inch Outlet Diameter Offers Improved Flow for Maximum Performance from a Cast Iron Exhaust Manifold
  • Designed to be Used with Hooker BlackHeart Engine Mounts (P/N 71221029HKR) and Transmission Crossmembers (P/N 71222020HKR, 71222018HKR, or 71222019HKR) for a Trouble-Free Install
  • Adapter pipes (P/N 71223024HKR) will adapt these manifolds to any of the Hooker BlackHeart exhaust systems for this application

About Hooker BlackHeart

The BlackHeart team utilizes the latest technology and materials to design exhaust systems, engine swap kits, and mufflers for both import and domestic cars and trucks. Hooker BlackHeart is platform-engineered to provide superb performance, aesthetics, and fitment.

Bolt SizeM8 x 1.25 x 25mm
Brand Hooker BlackHeart
CARB (California) CompliantNo
Collector Diameter2.50 inch
Emission Code8
EngineGM Small Block Gen III/IV (LS Based)
Exhaust SeriesHooker
Header FinishNatural
Header StyleManifold
MaterialCast Iron
Mounting Hardware IncludedYes
Primary Tube Dia.1-3/4 inch
Product TypeManifold
Tube MaterialCast Iron
Type of ComponentManifold
WarrantyLimited Lifetime Warranty
Part Number71223026HKR

This product is engineered to facilitate the installation of a later model, emissions friendly engine into a vintage / classic vehicle. Federal guidelines indicate that an engine swap is allowable if one or more of the following conditions apply:

  • If there is a reasonable basis for knowing that emissions are not adversely affected as described in the EPA Tampering Policy dated November 23rd, 2020
  • The resulting vehicle is identical (with regard to all emissions related parts, engine design parameters and engine calibrations) to a certified configuration of the same or newer model year as the vehicle chassis
  • The vehicle is a uncontrolled vehicle - Vehicles that were manufactured before emission control regulations took effect are called uncontrolled vehicles. Aftermarket parts regulations and anti-tampering laws do not apply to these vehicles
  • An EO legal engine swap kit is utilized (such as a GM EROD)
  • The vehicle is being used for Competition Use Only - Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street

Consumers are responsible for complying with laws prohibiting tampering, and for ensuring that modified vehicles are operated in a manner that complies with applicable laws.

Motor vehicle emissions standards are intended to help achieve and maintain air quality goals that benefit human health and the environment. The U.S. Environmental Protection Agency, the California Air Resources Board, Environment Canada, and other regulatory agencies prohibit the operation of vehicles on public roads that violate applicable emissions standards. The alteration of certified production vehicles to modify, remove, or render inoperable emissions control hardware or software, known as "tampering" is prohibited by the U.S. Clean Air Act and other laws. Tampering with motor vehicles emissions control systems is punishable by substantial monetary penalties.

Holley is committed to performance parts that allow enthusiasts to modify their vehicles and meet emission requirements. The information provided here is intended to provide general guidance of interest to most consumers. This guidance may not apply to all vehicles or all situations. It is up to each consumer to evaluate his or her own situation and take the steps necessary to comply with applicable laws. The websites listed below have more information about regulations and policies pertaining to motor vehicle emissions. You should also check the regulations applicable to your local area.

EPA Website

CARB Website

Designed to be used with Hooker BlackHeart Transmission Crossmembers (P/N 71222020HKR, 71222019HKR, or 71222018HKR) and Engine Mounts (P/N 71221029HKR) for a trouble free install.
Limited Lifetime Warranty: See Details

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    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.