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Hooker BlackHeart LS Swap Header Back Exhaust System

1975-1982 2WD K5 Blazer/Jimmy, 2.5 inch dual side exit (behind rear tires), 409 stainless steel

PART# BH14204

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Aggressive to moderate sound


This header back system is part of a complete exhaust solution for LS Swapped 1975 to 1982 2WD K5 Blazer/Jimmy. It uses an X-pipe and straight through absorption mufflers for a muscle car sound with reduced resonance. The tube geometry is designed to work with stock fuel tanks and allows a lowered stance.


  • Uses a high-efficiency X-pipe for increased performance and resonance reduction
  • Designed for use with BlackHeart LS Swap headers or cast manifolds and adapter pipes for simple exhaust system solution
  • 304 Stainless steel straight through designed absorption mufflers for a muscle car sound
  • Constructed of mandrel bent 409 stainless steel tubing for strength and durability
  • OE (original equipment) quality hardware and hangers provided to ensure excellent fitment and a leak free, simple installation
  • Works with OE Style rear mounted fuel tanks


Application1975-1982 2WD K5 Blazer/Jimmy
BrandHooker BlackHeart
Emission Code8
Exhaust SeriesHooker BlackHeart
Exit PositionDual Rear Side Exit (behind tires)
Inlet Diameter (in)2.5
Material409 Stainless Steel
Muffler Material304 Stainless Steel
Muffler Quantity2
Outlet Diameter (in)2.5
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
System TypeHeader-back
Tubing Diameter (in)2.5
Tubing Material409 Stainless Steel
Part NumberBH14204

Service Parts



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 EPA Memo 1A
  • 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

Tech Resources

2WD only Works with OE style rear mounted fuel tanks Designed for use with 12621HKR engine mounting brackets and 12646HKR transmission cross member and 1975-1987 Hooker C10 LS swap long tube headers or Hooker Cast manifolds with adapter pipes


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

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