ARP SBC/GENIII LS 3/8 Flange 12pt Header Bolt Kit

SKU: 134-1202 | UPC: 672036041984

ARP SBC/GENIII LS 3/8 Flange 12pt Header Bolt Kit 1955-2013 Chevy Small Block 1997-2007 Gen III LS

Secure exhaust headers on Small Block Chevy engines from 1955-2013 and Gen III LS engines from 1997-2007 with the ARP SBC/GENIII LS 3/8 Flange 12pt Header Bolt Kit. This complete kit of twelve 3/8-16 x 1-inch bolts fits 3/8-inch thick flanges on performance headers. Heat-treated chromoly construction handles extreme temperatures and engine vibration for reliable clamping and leak-free seals.

Key Features

• Chromoly Steel Build: Forged 8740 alloy heat-treated to 180,000 psi tensile strength resists fatigue from exhaust heat cycles and torque loads.
• 12-Point Head Design: Delivers firm grip during installation allowing full torque application without cam-out or rounding.
• Black Oxide Finish: Shields against rust and seizing in humid or salty environments for repeated removal.
• Precision 3/8-16 Threads: Rolled threads provide smooth engagement and consistent preload on 3/8-inch flanges.
• Kit of 12 Bolts: Exact quantity for both cylinder banks on V8 SBC and Gen III LS header setups.

Product Notes

• Confirm header flanges measure exactly 3/8-inch thick for proper fit.
• Pair with ARP thread lube to prevent galling and achieve accurate torque.
• Lightweight at 1 lb for easy handling and fast delivery.

Installation Notes

• Professional installation recommended.
• Apply assembly lube to threads and under bolt heads then torque to 30-35 ft-lbs in crisscross sequence.
• Compatible with standard SBC and Gen III LS header flanges no additional hardware needed.

This Part Fits

Year	Make	Model	Submodel
1955-2003	Chevrolet	Small Block Engines	262-400 V8
1965-1982	Chevrolet	Corvette	All V8
1967-2002	Chevrolet	Camaro	All V8
1997-2004	Chevrolet	Corvette	LS1 C5
1998-2002	Chevrolet	Camaro	LS1 Z28 SS
1999-2007	Chevrolet	Silverado 1500	5.3L 4.8L V8
1997-2004	Chevrolet	Express Van	LS1 Gen III V8
2004-2006	Pontiac	GTO	LS1 LS2

Why Choose ARP?

• Proven fasteners in NHRA Top Fuel and Pro Stock racing engines.
• Reliable clamping force in high-performance street and track builds.
• USA-made with exact tolerances for engine builders.

Frequently Asked Questions

• Q: Does this fit Gen IV LS engines?
  A: Designed for Gen III LS and SBC with 3/8-inch flanges. Gen IV headers often use thicker flanges measure yours to confirm compatibility.
• Q: What material and finish are used?
  A: 8740 chromoly steel heat-treated to 180,000 psi with black oxide coating for corrosion protection and easy reuse.
• Q: What warranty coverage applies?
  A: ARP offers limited lifetime warranty against breakage when installed and torqued correctly per instructions.

Shipping & Handling

• Method: UPS Ground
• Availability: In stock – ships same or next business day
• Packaging: Original ARP box
• Weight: 1 lb