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SKU: 134-3713 | UPC: 672036049249
ARP Chevrolet LSA 8740 Chromoly 12pt Head Bolt Kit for 2009-2015 Cadillac CTS-V and 2012-2015 Chevrolet Camaro ZL1
The ARP Chevrolet LSA 8740 Chromoly 12pt Head Bolt Kit replaces stock fasteners in supercharged 6.2L LSA engines. It fits 2009-2015 Cadillac CTS-V sedans and wagons plus 2012-2015 Chevrolet Camaro ZL1 models. This kit secures cylinder heads with high clamping loads to handle boost levels over 20 PSI in performance applications.
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
- 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
Product Notes
- Use ARP Ultra-Torque or moly assembly lube on threads and under washer faces
- Inspect head gasket flatness before installation ARP kit torque exceeds OEM specs
- Packaged in protective box for safe handling dimensions 12.75 x 8.25 x 1.5 inches
Installation Notes
- Professional installation recommended.
- Torque in sequence to ARP specs 50 ft-lbs initial then 90 degrees use new bolts only
- Compatible with multi-layer steel head gaskets for LSA heads and stock hardware locations
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2009-2015 | Cadillac | CTS | CTS-V |
| 2012-2015 | Chevrolet | Camaro | ZL1 |
Why Choose ARP?
- Decades of experience supplying fasteners to NHRA Top Fuel and Pro Stock teams
- Every kit undergoes rigorous proof load testing for consistent performance
- USA-made with tight tolerances for repeatable cylinder head clamping
Frequently Asked Questions
-
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 -
Q: What makes 8740 chromoly different from other steels?
A: 8740 chromoly offers higher fatigue resistance and yield strength than 4340 used in some kits ideal for repeated boost cycles -
Q: What warranty coverage applies?
A: ARP provides warranty against defects in materials or workmanship when installed and torqued per instructions
Shipping & Handling
- 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
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