ARP Chevrolet Small Block LS 12pt Head Bolt Kit (Fits LS, 2004 & later except LS9)

This ARP performance fastener, stud, bolt, tool, or assembly is the Chevrolet Small Block LS 12pt Head Bolt Kit (Fits LS, 2004 & later except LS9). 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

• ARP2000 Alloy Construction: Forged from proprietary material with 220,000 PSI tensile strength to handle extreme horsepower and boost levels without stretching or fatigue.
• Complete Kit Contents: Includes 16 long bolts (6.750 inches) and 16 short bolts (3.155 inches) for both cylinder heads, ready for immediate installation.
• 12-Point Bolt Design: Allows precise wrench engagement for accurate torquing up to 70 ft-lbs, reducing slip risk and ensuring even clamping force across the head.
• High Clamp Load: Delivers up to 45% more clamping force than OEM bolts, preventing gasket blowout in high-performance applications.
• Bolts are forged from ARP2000 chrome moly alloy with 220,000 PSI tensile strength and black oxide coating for corrosion resistance.
• Black Oxide Finish: Provides rust and corrosion protection for long-term durability in harsh engine environments.

Fitment

Specifications

What’s Included

One new ARP head stud & bolt kit 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.

Related Parts

• Shop all ARP products
• ARP 01-10 6.6L GM Duramax Diesel Head Stud Kit
• ARP 02-06 Mini Cooper Head Bolt Kit
• ARP 02-06 Mini Cooper S Head Stud Kit

Frequently Asked Questions

How do I confirm the Chevrolet Small Block LS 12pt Head Bolt Kit (Fits LS, 2004 & later except LS9) 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 234-3725, 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.