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Holley 97-320 Harmonic Balancer Bolt Chevy Small Block 12-Point Grade 9

Manufacturer

Picture for manufacturer Holley

Part Number

97-320
8 reviews
Sale Price

$20.89

In Stock (10+)

delivery box

Usually delivered within 2 days

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Live-in-stock inventory

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Fitment guaranteed

Fitment guaranteed

Product Details

The Holley 97-320 is a premium harmonic balancer bolt engineered specifically for Chevy small block applications. This high-strength fastener features a Grade 9 rating with an impressive 180,000 PSI tensile strength, ensuring reliable crank retention under extreme operating conditions.

Key Features:

  • 12-point bolt head design with 7/16" wrench size for positive engagement and reduced stripping risk
  • Grade 9 steel construction rated at 180,000 PSI tensile strength for maximum holding power
  • Black E-coat finish provides superior corrosion resistance and professional appearance
  • Reusable design - not torque-to-yield, allowing for multiple installations without replacement
  • Includes extra-thick oversized washer (.200" thick x 1.5" diameter) for optimal load distribution
  • Direct fit for Chevy small block harmonic balancers

This premium fastener offers a significant upgrade over OEM hardware, providing the strength and reliability needed for high-performance and racing applications while remaining suitable for street use. The non-torque-to-yield design makes it an economical choice for engine builders who frequently assemble and disassemble engines.

Products specifications

Bolt Grade

10.9

Brand

Holley

Category

Engine

Color

Black

Emission Code

6

Engine

Chevrolet Small Block Gen I

Finish

Black E-Coat

Grade Type

Performance

Head Drive Type

12 Point

Head Style

12-point

Length

2.8

Material

Steel

Part Type

Engine Harmonic Balancer Bolt

Product Type

Harmonic Balancer Bolts

PSI Rating

180,000

Reusable

Yes

Sub Category

Hardware, Fasteners and Fittings

Thread Diameter

7/16

Thread Pitch

20

Thread Size

7/16-20

Under Head Length

2.800"

Universal Or Specific Fit

Universal

Warning

California Proposition 65

Washer Included

Yes

Washer Size

.200" Thick x 1.5" Diameter

Wrench Size

7/16"

easy and good.

very easy

Had what I was looking for....

Quick turnaround on a tire that I couldn't find anywhere else.

Great price, very reasonable shipping cost, arrived quickly.

Product in line with expectations, received in perfect conditions.

Quick and easy

Ok

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