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This ARP performance fastener, stud, bolt, tool, or assembly is the Chevrolet LSA 8740 Chromoly 12pt Head 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
- 8740 Chromoly Steel: Forged alloy heat treated to 200,000 PSI tensile strength resists fatigue and stretching in high cylinder pressure environments.
- 12-Point Heads: Precision machined for socket engagement that prevents cam-out during torquing and service.
- Complete 20-Piece Kit: Includes 20 head bolts and hardened washers for both cylinder heads with exact LSA lengths.
- Black Oxide Finish: Protects against rust corrosion and thread galling in engine oil exposure.
- High-Boost Design: Engineered for supercharged LS engines maintaining seal integrity at 800+ horsepower.
- Compatible with multi-layer steel head gaskets for LSA heads and stock hardware locations.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| Universal or specification-matched application. Verify every dimension, interface, load or operating requirement, and listing note. | |||
Specifications
| Brand | ARP |
|---|---|
| Manufacturer Part Number | 134-3713 |
| Product Type | Head Stud & Bolt Kits |
| Condition | New |
| Configuration | Chevrolet LSA 8740 Chromoly 12pt Head Bolt Kit |
| 8740 Chromoly Steel | Forged alloy heat treated to 200,000 PSI tensile strength resists fatigue and stretching in high cylinder pressure environments |
| 12-Point Heads | Precision machined for socket engagement that prevents cam-out during torquing and service |
| Black Oxide Finish | Protects against rust corrosion and thread galling in engine oil exposure |
| Complete 20-Piece Kit | Includes 20 head bolts and hardened washers for both cylinder heads with exact LSA lengths |
| High-Boost Design | Engineered for supercharged LS engines maintaining seal integrity at 800+ horsepower |
| Q | Does this kit fit LS3 or LS9 engines? A: No this kit uses specific lengths and thread pitch for LSA supercharged heads only LS3 requires ARP 134-3601 |
| Method | UPS Ground or FedEx Ground |
| Availability | In stock - ships same or next business day |
| Packaging | Secure box 12.75 x 8.25 x 1.5 inches |
| Weight | 4.65 lbs |
| Key Features 8740 Chromoly Steel | Forged alloy heat treated to 200,000 PSI tensile strength resists fatigue and stretching in high cylinder pressure environments 12-Point |
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.
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- Shop all ARP products
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Frequently Asked Questions
How do I confirm the Chevrolet LSA 8740 Chromoly 12pt Head 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
- Confirm ARP part number 134-3713, the complete application, and every required supporting component before beginning work.
- Clean and inspect all mating threads and components, then verify thread engagement, length, washers, nuts, lubricant, and required preparation before assembly.
- Follow ARP's current tightening sequence, lubricant instructions, torque or stretch method, and any retorque procedure for this exact part.
- Verify clearance, preload, fastener seating, and normal component operation before returning the vehicle or engine to service.
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