This ARP harmonic balancer bolt is built for Small Block Chevy engines and features a 1/2 in square drive along with a 1-1/8 in hex head, machined from chromoly with a black oxide finish. A washer is included.
Specifications:
- Type: Harmonic Balancer Bolt
- Thread: 7/16-20 in
- Head Style: 1-1/8 in Hex Head
- Drive: 1/2 in Square Drive
- Hardware: Washer Included
- Material: Chromoly
- Finish: Black Oxide
- Quantity: Each
- Part Number: 134-2503
Applications:
- Small Block Chevy engines
FAQ
What engines does this harmonic balancer bolt fit?
This bolt is designed for Small Block Chevy engines.
What makes this bolt different from a standard balancer bolt?
It features a 1/2 in square drive in addition to a 1-1/8 in hex head, with a 7/16-20 in thread.
Is a washer included?
Yes, a washer is included with each bolt.

