Product Description:
Hawks Motorsports is pleased to offer our clients the following GM LS7 Harmonic Balancer Crank Bolt, 12-Point, M16 x 2.0, ARP (234-2504). This ARP harmonic balancer bolt is designed for Chevrolet LS7 applications and uses an M16 x 2.0 thread, 5.225-inch underhead length, 12-point head, and 8740 chrome moly construction. The bolt is supplied with a wide-area washer for harmonic damper installation.
For the gearhead building an LS7, this is one of those fasteners you don't want to overlook when you're putting serious attention into the bottom end. The harmonic balancer is dealing with the constant twisting and flexing of the crankshaft, so having the correct high-strength crank bolt is part of making sure the damper stays where it belongs when the RPM starts climbing. The extra-tall 12-point head also gives you solid deep-socket engagement, which is exactly the kind of detail that makes life easier when you're assembling a serious LS-powered combination.
ARP identifies the 234-2504 for Chevrolet Gen III/LS7-series applications, while current application information also identifies the bolt for dry-sump LS and LT configurations. The current ARP specification lists an M16 x 2.0 thread and 5.225-inch underhead length.
The 234-2504 features a black oxide finish and 8740 chrome moly construction. It is sold individually and uses a 1-1/16-inch 12-point socket. ARP's installation instructions specify the use of ARP Ultra-Torque Fastener Assembly Lubricant and a final torque of 235 ft-lbs for this application.
KEY FEATURES
- Part Number: 234-2504
- Brand: ARP
- Harmonic balancer/crankshaft bolt
- Designed for Chevrolet LS7 applications
- 12-point head design
- M16 x 2.0 thread
- 5.225" underhead length
- 1-1/16" socket size
- 8740 chrome moly construction
- Black oxide finish
- Wide-area washer included
- Sold individually
- Designed for high-strength harmonic damper retention
- ARP installation instructions specify 235 ft-lbs using ARP Ultra-Torque lubricant
PRODUCT SPECIFICATIONS
| Specification | Details |
|---|---|
| Brand | ARP |
| Part Number | 234-2504 |
| Product Type | Harmonic Balancer / Crank Bolt |
| Application | Chevrolet LS7 / Dry-Sump LS & LT Applications |
| Material | 8740 Chrome Moly |
| Finish | Black Oxide |
| Head Style | 12-Point |
| Thread Size | M16 x 2.0 |
| Underhead Length | 5.225" |
| Socket Size | 1-1/16" 12-Point |
| Quantity | 1 |
| Washer | Included |
| ARP Installation Torque | 235 ft-lbs with ARP Ultra-Torque lubricant |
VEHICLE FITMENT / FITS THE FOLLOWING MODELS
Chevrolet LS7 7.0L
The ARP 234-2504 is specifically identified for the Gen IV Chevrolet 7.0L LS7 harmonic balancer application.
Known LS7 applications include:
- 2006-2013 Chevrolet Corvette Z06 — 7.0L LS7
- 2014 Chevrolet Camaro Z/28 — 7.0L LS7
The application should be verified by engine configuration rather than vehicle name alone.
Additional Dry-Sump Applications
Current ARP and aftermarket application data also identifies 234-2504 for certain dry-sump Gen III/IV LS and Gen V LT applications, including LT1/LT4 configurations.
Important: This is a dry-sump-specific application. Verify engine configuration before ordering.
IMPORTANT APPLICATION NOTES AND EXCLUSIONS
- Designed around the M16 x 2.0 crankshaft thread used by the applicable LS/LT dry-sump engines.
- 5.225" underhead length must be verified against the specific engine and damper configuration.
- This part is sold individually.
- 12-point head requires a 1-1/16" 12-point socket.
- Current ARP documentation identifies 234-2504 for LS7 and related LS/LT applications.
- Do not assume fitment on wet-sump LS or LT engines based solely on engine family.
- Verify the exact engine, crankshaft, harmonic balancer and oiling configuration before ordering.
- Do not substitute another crank bolt based solely on thread diameter or apparent length.
INSTALLATION NOTES
- Verify the engine application and part number before installation.
- Clean and inspect the crankshaft threads before installation.
- Chase the crankshaft threads if necessary to ensure proper thread engagement.
- ARP instructs users to lubricate the bolt threads, underside of the bolt head and the front face of the balancer with ARP Ultra-Torque Fastener Assembly Lubricant.
- Install the washer onto the bolt before installation.
- Hand-tighten the bolt before final torque.
- ARP specifies 235 ft-lbs using ARP Ultra-Torque Fastener Assembly Lubricant.
- Follow the current ARP installation instructions for the exact application.
- Verify harmonic balancer seating and crankshaft/balancer alignment before final tightening.
FREQUENTLY ASKED QUESTIONS
What is ARP 234-2504?
ARP 234-2504 is a 12-point harmonic balancer crank bolt designed for Chevrolet LS7 and other specified dry-sump LS/LT applications.
What engines does 234-2504 fit?
The primary documented application is the 7.0L LS7. Current ARP information also lists Gen IV LS and Gen V LT applications, while retailer application data identifies dry-sump LT1/LT4 configurations.
What size is the crank bolt?
The bolt uses an M16 x 2.0 thread and has a 5.225-inch underhead length.
What type of bolt head does it have?
The 234-2504 uses an extra-tall 12-point head designed for a 1-1/16-inch 12-point socket.
What is the bolt made from?
ARP identifies the material as 8740 chrome moly.
What finish does the bolt have?
The 234-2504 uses a black oxide finish.
How many bolts are included?
The 234-2504 is sold as one harmonic balancer bolt with the specified washer.
What torque does ARP specify?
ARP's installation instructions specify 235 ft-lbs using ARP Ultra-Torque Fastener Assembly Lubricant.
Does this fit wet-sump LS engines?
Do not assume it does. The documented application is associated with LS7 and specified dry-sump LS/LT configurations. Verify the exact engine configuration before ordering.
