This ARP harmonic balancer bolt is built for Big Block and Small Block Ford engines. It features a 5/8-18 thread with a 1-1/8 in hex head sized for a 1/2 in square drive. Machined from chromoly steel with a black oxide finish, it includes a washer.
Specifications:
- Thread: 5/8-18 in
- Head: 1-1/8 in Hex
- Drive: 1/2 in Square
- Washer: Included
- Material: Chromoly Steel
- Finish: Black Oxide
- Quantity: Each
- Part Number: 150-2503
Applications:
- Big Block Ford
- Small Block Ford
FAQ
What engines does this balancer bolt fit?
It's designed for Big Block and Small Block Ford engines.
What head style does it use?
A 1-1/8 in hex head sized for a 1/2 in square drive.
What thread size is the bolt?
5/8-18.
Does it come with a washer?
Yes, a washer is included.

