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Hooker 7521HKR Super Competition Long Tube Headers - Painted

Part # 7521HKR Be the first to write a review

Compatible with 75-87 Chevy/GMC 1/2, 3/4 & 1-Ton Trucks, 75-91 Blazer/Carryall/Jimmy/Suburban/1-Ton Crew Cab: 396-502 Tube Size 1.875 in. x 31 in., Collector Size 3 in., Collector Length 10 in., Port Shape: Same As Port

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Hooker 7521HKR Super Competition Long Tube Headers - Painted

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Hooker Competition headers offer the best value in the high performance header market. Designed for the value-conscious buyer who is running either a stock or mildly-modified engine, Hooker Competition headers offer premium features at a very competitive price. Made of durable 16 gauge mild steel tubing, the Hooker Competition header design utilizes a long transition collector to reduce back pressure and increase exhaust flow. A perfect sealing surface is assured with the 5/16 in. machined flanges, with welded O-ring seals. Experience has proven that this flange size is ideal to maintain header integrity and be pliable enough to seal each exhaust port. Tubing is mandrel-bent to maintain metal strength and provide consistent tube diameter at radii to maximize performance. Hooker Competition headers have a standard finish that features a heat-cured, high-heat-resistant paint. Optionally, the famous Hooker Ceramic Thermal Barrier Coating is available.

Features:

  • Tuned-length primary tubes for street performance
  • Mandrel-bent tubing for smooth exhaust flow
  • Light weight & sturdy 16 gauge tubing
  • Long transition collector for decreased back pressure
  • 5/16” machined flanges for a perfect seal
  • Industry’s best welds for durability
  • designed for easy, trouble-free fit
  • All necessary hardware included for a complete installation
  • Works with factory power steering, power brakes and air conditioning
  • For 4 wheel drive applications
Brand Hooker
Emission Code4
Product TypeLong Tube Headers
UPC090127067512
Manufacturer Part Number7521HKR
Part Number7521HKR
4

This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • 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.

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

Instructions for Part # 7521HKR
Does not fit with angle plug heads or raised port heads. Will not work with close ratio steering boxes. Installation requires air conditioning bracket #10925HKR left side, 10926HKR right side. On 1979 and later vehicles with short compressors, use stock bracket. Breaking in an engine with ceramic coated headers WILL result in damage to the coating and will VOID all warranties. Ceramic coated headers require several heat cycles to fully cure before they will withstand extreme heat. Hooker recommends using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage. Please call Hooker tech service at 270-781-9741 for additional information regarding ceramic coated exhaust products. The use of header wraps can cause the header tubes to crack or rust due to excessive heat and moisture build-up. Hooker does not recommend the use of header wraps as this will void the warranty.
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