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SKU: 234-3725 | UPC: 672036049263
ARP Chevrolet Small Block LS 12pt Head Bolt Kit (Fits 2004+ LS Cathedral Port Heads except LS9)
Secure your LS engine with ARP's 12-point head bolt kit designed for 2004 and later Chevrolet small block LS engines featuring cathedral port heads, excluding the LS9. This 32-piece kit replaces factory bolts with stronger components that maintain head gasket seal under high cylinder pressures from boost or nitrous. Ideal for performance builds in Corvettes, trucks, and muscle cars.
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.
- 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.
- 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.
- Black Oxide Finish: Provides rust and corrosion protection for long-term durability in harsh engine environments.
- High Clamp Load: Delivers up to 45% more clamping force than OEM bolts, preventing gasket blowout in high-performance applications.
Product Notes
- Use ARP Ultra-Torque fastener lubricant or moly paste on threads and under bolt heads for correct torque values.
- Follow ARP torque specs: 70 ft-lbs in three stages with proper lubing to avoid over-torquing.
- Special order item. allow extra time for processing if out of stock.
Installation Notes
- Professional installation recommended.
- Clean block threads thoroughly and chase with ARP thread chaser before assembly.
- Compatible with OEM or aftermarket cathedral port LS heads. not for rectangular port heads like LS3 or LS9.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2005-2007 | Chevrolet | Corvette | Base, Standard (LS2) |
| 2004-2006 | Pontiac | GTO | Base (LS1, LS2) |
| 2006-2008 | Pontiac | Grand Prix | GXP (LS4) |
| 2005-2009 | Chevrolet | TrailBlazer | SS (LS2) |
| 2007-2009 | Chevrolet | Silverado 1500 | LTZ, WT (6.0L LY6) |
| 2007-2009 | GMC | Sierra 1500 | SLE, SLT (6.0L L96) |
| 2005-2007 | Chevrolet | Express 2500 | Base (6.0L LQ4) |
| 2005-2009 | Chevrolet | Colorado | Z71 (5.3L LH8) |
Why Choose ARP?
- ARP sets the standard for engine fasteners trusted in professional racing for decades.
- Every bolt exceeds OEM specs for strength and fatigue resistance in demanding conditions.
- Precision machining ensures perfect fit and repeatable torque on LS engines.
Frequently Asked Questions
-
Q: Will this kit fit 2008+ LS3 engines?
A: No, this kit fits only 2004+ cathedral port LS heads like LS2 and LS4. LS3 uses rectangular port heads requiring ARP kit 234-3731. -
Q: What material are the bolts made from?
A: Bolts are forged from ARP2000 chrome moly alloy with 220,000 PSI tensile strength and black oxide coating for corrosion resistance. -
Q: What is the warranty and torque procedure?
A: ARP provides a lifetime warranty against breakage. torque to 70 ft-lbs using ARP lube in three steps: 25, 40, then 70 ft-lbs.
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Shipped in protective ARP box, 10 x 8 x 2 inches
- Weight: 4.2 lbs
ARP
ARP (Automotive Racing Products) is the world’s premier manufacturer of high-strength engine and driveline fasteners—head studs and bolts, main studs, rod bolts, and more—engineered and manufactured in-house from start to finish for race-proven reliability. With vertically integrated processes that include cold heading, machining, heat-treating, thread rolling after heat treat, and rigorous QA, ARP maintains aerospace-level certifications (ISO 9001 and AS9100) and validates every part for repeatable clamp load and fatigue resistance. Signature alloys such as 8740 chromoly, ARP2000, L19, and Custom Age 625+ deliver ultimate tensile strengths up to the super-alloy range, while ARP Ultra-Torque fastener assembly lubricant helps achieve consistent pre-load during installation. From street performance builds to professional motorsport programs, ARP fasteners provide precise fitment, superior metallurgy, and the durability needed to keep engines together at elevated cylinder pressures and...
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