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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
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