Product Description:
Hawks Motorsports is pleased to offer our clients the 134-1003 LS3 3-Bolt Cam Sprocket Bolt Kit, ARP. This ARP cam sprocket bolt kit is designed for GM Gen III/LS-series engines using a 3-bolt camshaft and timing gear. The kit includes three M8 x 1.25 bolts with a 25mm underhead length and 10mm hex head.
When you're putting together an LS engine, cam timing hardware isn't the place to cut corners. These ARP bolts give a three-bolt LS cam setup solid clamping hardware while keeping the fastener package clean and compact. The 134-1003 uses heat-treated 8740 chromoly construction, black oxide finish, and a reduced-size hex head for easier installation and removal.
The 134-1003 is a cam sprocket bolt kit, not a camshaft retaining-plate bolt kit. ARP lists this part for Gen III LS applications, while current LS application sources identify it for 3-bolt LS camshafts including LS1, LS2, LS3 and other LS-family applications.
KEY FEATURES
- ARP Part Number: 134-1003
- Brand: ARP
- Cam sprocket bolt kit for 3-bolt LS camshafts
- Designed for GM Gen III/LS-series applications
- Set of 3 bolts
- 8740 chromoly steel construction
- Heat-treated material
- Black oxide finish
- Hex-head design
- 10mm hex
- M8 x 1.25 thread
- 25mm underhead length
- Approximately 180,000 psi tensile strength for the High Performance version
- Increased preload clamping force
- Designed to provide positive timing gear register
- Reduced head size for easier installation and removal
- Oversized flange helps with cam button retention where applicable
PRODUCT SPECIFICATIONS
| Specification | Details |
|---|---|
| Manufacturer | ARP |
| Part Number | 134-1003 |
| Product Type | Cam Sprocket Bolt Kit |
| Application | GM Gen III/LS Series |
| Camshaft Configuration | 3-Bolt |
| Quantity | 3 Bolts |
| Material | 8740 Chromoly Steel |
| Finish | Black Oxide |
| Head Style | Hex |
| Wrench Size | 10mm |
| Thread Size | M8 x 1.25 |
| Underhead Length | 25mm / 0.984" |
| Tensile Strength | Approximately 180,000 psi |
| Shipping Weight | 0.12 lb |
| Shipping Dimensions | 5.9" L × 3.95" W × 0.65" H |
ARP's application guide identifies 134-1003 as the Gen III/LS Series small-block cam sprocket bolt kit, with M8 x 1.25 threads, 25mm underhead length and 10mm wrenching size. ARP specifies 8740 chromoly construction and a nominal 180,000 psi tensile rating for its High Performance cam bolt kits.
VEHICLE FITMENT / FITS THE FOLLOWING MODELS
The 134-1003 is an engine/application-specific fastener, so the camshaft and timing-gear configuration should be verified rather than relying solely on vehicle year.
Verified LS Applications
- LS1
- LS2
- LS3
- LS6
- LS7
- L76
- L77
- L98
- LSA
- LS9
- LSX
- Other GM Gen III/IV LS-based engines using the 3-bolt cam sprocket configuration
Examples of Vehicle Applications
Depending on the engine and camshaft configuration, current application data includes:
- Chevrolet Camaro
- Chevrolet Corvette
- Pontiac Firebird / Trans Am
- Pontiac GTO
- Cadillac CTS-V
- Chevrolet SSR
- Other GM vehicles equipped with applicable LS-series engines
IMPORTANT APPLICATION NOTES AND EXCLUSIONS
- This kit is for 3-bolt LS camshaft applications.
- Verify that the camshaft and timing sprocket use the three-bolt mounting pattern before ordering.
- The 134-1003 is a cam sprocket bolt kit, not the camshaft retainer plate bolt kit.
- Do not assume compatibility based solely on engine displacement or vehicle year.
- LS engines and aftermarket camshaft combinations can vary, so verify the actual camshaft/timing-gear configuration.
- This kit contains three cam sprocket bolts.
- The manufacturer identifies the application broadly as the GM Gen III/LS series rather than limiting the part exclusively to the LS3.
INSTALLATION NOTES
- Clean and inspect all fasteners before installation.
- Clean the female threads to ensure proper engagement and accurate torque readings.
- Apply ARP Ultra-Torque Fastener Assembly Lubricant to the bolt threads and underside of the bolt heads as specified by ARP.
- ARP's installation instructions specify 25 ft-lbs torque for the 134-1003 cam bolts.
- Follow the current ARP installation instructions for the exact lubrication procedure and torque specification.
- Verify that the cam sprocket is properly seated against the camshaft before final tightening.
- Confirm proper camshaft timing and timing-chain installation according to the engine and camshaft manufacturer's instructions.
FREQUENTLY ASKED QUESTIONS
What is ARP 134-1003?
ARP 134-1003 is a three-bolt LS cam sprocket bolt kit consisting of three M8 x 1.25 × 25mm hex-head bolts.
Does 134-1003 fit an LS3?
Yes. Current application information identifies 134-1003 for LS3 applications using the 3-bolt camshaft/timing-gear configuration.
How many bolts are included?
The kit contains three cam sprocket bolts.
What size are the ARP 134-1003 bolts?
They use an M8 x 1.25 thread and have a 25mm underhead length. The head uses a 10mm hex.
What are these bolts made from?
ARP identifies the cam sprocket bolts as 8740 chromoly steel that is heat treated for increased strength.
What finish do these cam bolts have?
The 134-1003 uses a black oxide finish.
Are these 12-point bolts?
No. The 134-1003 is a hex-head cam sprocket bolt kit with a 10mm wrenching size.
What is the recommended torque?
ARP's installation instructions specify 25 ft-lbs for the 134-1003 cam bolts when installed according to ARP's specified procedure.
Can these bolts be used with an aftermarket 3-bolt LS camshaft?
They are intended for 3-bolt LS camshaft/timing-gear applications. Verify that the aftermarket camshaft and timing gear use the correct M8 x 1.25 mounting configuration before installation.
Are these the cam retainer plate bolts?
No. ARP lists 134-1002 as the LS cam retainer plate bolt kit and 134-1003 as the LS cam sprocket bolt kit.
