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Top Street Performance

Pro Series GM Gen III/IV LS Header Bolt Kit

Pro Series GM Gen III/IV LS Header Bolt Kit

SKU: 734-86052

$31.43
$31.43 $35.72
Shipping calculated at checkout.

In stock

Top Street Performance (TSP) is committed to providing high-quality performance parts while complying with emissions regulations. This product is designed for use on vehicles that comply with federal emissions regulations. It is the customer’s responsibility to verify that this part is legal for use in their state or local jurisdiction. Check with your local emissions authority before purchasing.

Product Details

Features

  • Fits GM Gen III/IV LS engines (LS1, LS2, LS3, LS6, LS7 & Vortec variants)
  • Designed for header and exhaust manifold installation
  • High-strength bolts provide secure clamping under heat and vibration
  • Ideal for header installs, exhaust upgrades, and engine builds

Description

Secure your exhaust system with the Pro Series LS Header Bolt Kit, designed for GM Gen III and Gen IV LS engines.

When installing headers or replacing exhaust manifold hardware, using the correct fasteners is critical for maintaining a proper seal. Factory bolts can loosen over time due to heat cycles and vibration, leading to exhaust leaks and reduced performance.

This kit provides reliable clamping force and consistent fitment, helping ensure a tight seal between the cylinder head and exhaust manifold or header flange. Designed for durability, these bolts are built to handle high-temperature environments commonly found in LS engine applications.

Manufactured from heat-treated high-strength steel, these fasteners offer improved resistance to stretching and loosening compared to worn or reused factory hardware. Whether you're installing aftermarket headers or refreshing OEM components, this kit delivers dependable performance.

Specs

Torque 28ft-lbs
Color Black
Fastener Type Header / exhaust manifold bolt
Grade Performance
Head Style Hex
Material 35 Chromoly Steel
Thread Size M8 x 1.25
Length Approx. 25mm underhead
Quantity Sold as a kit

Engine Fitment

COMPATIBLE WITH
CHEVROLET SMALL BLOCK V8 GEN. III/IV (LS BASED)
• 4.8L / 293 in3 (LR4 / LY2)
• 5.3L / 325 in3 (LM7 / L59 / LC9 / LH6 / LY5)
• 5.7L / 346 in3 (LS1 / LS6)
• 6.0L / 364 in3 (LQ4 / LQ9 / LS2)
• 6.2L / 376 in3 (LS3 / L92 / L99)

Vehicle Applications
• Chevrolet Silverado / GMC Sierra (4.8L / 5.3L / 6.0L / 6.2L)
• Chevrolet Camaro / Pontiac GTO (LS1 / LS2 / LS3)
• Chevrolet Corvette (C5 / C6 LS engines)
• Cadillac CTS-V (LS-based engines)
• GM LS engine swap applications

Q&A

Emissions Notice

This product does not affect vehicle emissions and is not subject to emissions compliance regulations.