ARP Harmonic Balancer Bolt Kit 12-Point 289/302/351W



  • 12-Point Bolt
  • Made In The USA!
  • Black Oxide Finish
  • 190,000 PSI Tensile Strength
MSRP $47.05
You save 32%

ARP 12-Point Harmonic Balancer Bolt Kit for all 289, 302 and 351 Windsor Engines.

Operating an engine without a functioning harmonic dampener is like taking punches from a pro boxer that isn’t wearing gloves. Just like a boxing glove, the harmonic dampener absorbs an unbelievable amount of kinetic energy in your 289, 302 or 351 Windsor engine as the crankshaft flexes and twists. To make sure your harmonic dampener is locked in position, this ARP 150-2501 12-Point Harmonic Balancer Bolt Kit is designed to exhibit massive clamping force.

Constructed of 8740 chromoly steel for durability and strength, this harmonic balancer bolt kit is finished off with a black oxide coat. The exertion of maximum clamping force is achieved by using 190,000 PSI rated bolts. This kit is finished off with a 1/4” thick, wide area washer and am extra tall 12-point head that accepts a deep socket and eliminates any potential stripping.

Features and Benefits:
- 8740 chromoly steel construction
- Black oxide finishing coat
- Includes flat washers
- Premium grade
- High performance
- Made in America
- Easy to install

- Thread Size: 5/8”-5/18”
- Underhead Length: 2.050”
- Head Style: 12-point
- Washer Included: Yes
- Fastener Yield Strength (psi): 190,000 psi
- Fastener Material: 8740 chromoly
- Fastener Finish: Black oxide

- 1965-1995 Mustang
- 1966-1977 Bronco
- 1973-1979 F100

Your engine is held together by a myriad of nuts, bolts and screws, which allow it to work despite the incredible pressures and forces acting upon it. However, what happens if that hardware fails, or you need to upgrade it to handle additional performance? With the hardware from ARP, you're getting the best products on the market, and those trusted by Formula 1, IndyCar, NHRA and NASCAR.

Please Note: While following the manufacturers recommended torque sequence, tighten the nuts to the ARP recommended torque specifications using ARP Ultra-Torque Fastener Assembly Lubricant.

Tech Tip: ARP recommends using the ARP Ultra-Torque Fastener Assembly Lubricant as opposed to motor oil or other low quality lubricants. This is due to higher friction on the studs as well as inconsistencies in the clamping force of the fasteners when insufficient lubricants are used.

Order this ARP 150-2501 12-Point Harmonic Balancer Bolt Kit for your 289, 302 or 351 Windsor Engine today from CJ Pony Parts.

California Residents: Proposition 65 Warning

Installation Difficulty


Novice skill is required for this installation.

Installation Videos

Video Transcript

We’re here with an ARP 12-point Harmonic Balancer Bolt, fitting your 289, 302, and 351 Windsor Engine. High quality hardware from ARP is a great way to take your engine build to the next level. This 12-point bolt from ARP is gonna replace the factory bolt that holds the harmonic balancer to your engine, which can cause catastrophic failure if it would fail. This bolt is much stronger than the original bolt, made of 8740 chromoly steel with a black oxide finish. It includes the flat washer for installation and is made right here, in the USA.

Vehicle Fitment

This product will fit the following Bronco years:

This product will fit the following F-100 years:

This product will fit the following Mustang years:

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