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

This ARP performance fastener, stud, bolt, tool, or assembly is the SBC/GENIII LS 3/8 Flange 12pt Header Bolt Kit. Confirm the exact engine or vehicle application, thread size, length, material, strength series, included quantity, installation lubricant, tightening sequence, and current ARP torque specification before ordering.

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.
• 8740 chromoly steel heat-treated to 180,000 psi with black oxide coating for corrosion protection and easy reuse.
• 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.
• Pair with ARP thread lube to prevent galling and achieve accurate torque.

Fitment

Specifications

What’s Included

One new ARP hardware kits – other in the exact configuration and quantity identified by this listing. Brackets, wiring, air lines, fittings, switches, fasteners, fitting kits, fluids, covers, and accessories are included only when expressly stated for this exact part.

About ARP

Automotive Racing Products manufactures high-performance studs, bolts, nuts, washers, wheel hardware, assembly tools, and installation lubricants for engine, drivetrain, chassis, and racing applications. Thread dimensions, material, preload method, lubricant, torque, and included quantity remain exact-part specific.

Important Disclosures

• California Proposition 65 warning applies. Review the current manufacturer warning before handling or installation.

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• Shop all ARP products
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Frequently Asked Questions

How do I confirm the SBC/GENIII LS 3/8 Flange 12pt Header Bolt Kit fits my application?
Match the exact engine family or vehicle, component location, thread diameter and pitch, under-head length, material, strength series, and every current ARP application note.

Can I reuse the factory torque value with this ARP hardware?
Not automatically. Use ARP’s current instructions for the exact part, material, lubricant, tightening sequence, and preload method. Factory torque values may be based on different hardware and friction.

What is included with this ARP kit?
Only the studs, bolts, nuts, washers, lubricant, and tools expressly listed for this exact part number are included. Verify the required quantity before disassembly.

Installation Instructions

1. Confirm ARP part number 134-1202, the complete application, and every required supporting component before beginning work.
2. Clean and inspect all mating threads and components, then verify thread engagement, length, washers, nuts, lubricant, and required preparation before assembly.
3. Follow ARP’s current tightening sequence, lubricant instructions, torque or stretch method, and any retorque procedure for this exact part.
4. Verify clearance, preload, fastener seating, and normal component operation before returning the vehicle or engine to service.