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Holley

Holley Replacement Harmonic Balancer Bolts 97-321 Bolts, Replacement, Steel, Black E-Coat, 1/2 in.-20 Thread, 2.5 in. Long, 12-Point Head, Washer included, Chevy, 6.5-8.1L, Each

SKU: HLY97-321

Harmonic Balancer Bolts
Holley Replacement Harmonic Balancer Bolts 97-321 Bolts, Replacement, Steel, Black E-Coat, 1/2 in.-20 Thread, 2.5 in. Long, 12-Point Head, Washer included, Chevy, 6.5-8.1L, Each

Holley

Holley Replacement Harmonic Balancer Bolts 97-321 Bolts, Replacement, Steel, Black E-Coat, 1/2 in.-20 Thread, 2.5 in. Long, 12-Point Head, Washer included, Chevy, 6.5-8.1L, Each

SKU: HLY97-321

Harmonic Balancer Bolts
A$41.48
BACKORDER This item will be special ordered in for you. Contact us prior to purchase if you require an ETA.
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Description

Holley harmonic balancer bolts offer the perfect fit to properly install your harmonic balancer on your engine with a Holley mid-mount accessory drive. The replacement hardware is available for Chevy big block or small block applications. Each one includes a balancer bolt and thick washer.

Features:

* 180,000 psi rating (Grade 9)
* Made from steel
* Black E-coat finish
* Big block--1/2 in. wrench size
* Small block--7/16 in. wrench size

Part Type

Harmonic Balancer Bolts

Data: v4.2 - Upd: 2026-10-17 03:12:56

Specifications

Product Attributes - Brand
Holley
Product Attributes - Manufacturer's Part Number
97-321
Product Attributes - Part Type
Harmonic Balancer Bolts
Product Attributes - Product Line
Holley Replacement Harmonic Balancer Bolts
Product Attributes - UPC
090127068991
Product Attributes - Thread Size
1 1/2 in.-16
Product Attributes - Underhead Length (in.)
2.500 in.
Product Attributes - Head Style
12-point
Product Attributes - Washer Included
Yes
Product Attributes - Fastener Tensile Strength (psi)
180,000 psi
Product Attributes - Fastener Material
Steel
Product Attributes - Fastener Color
Black
Product Attributes - Quantity
Sold individually.

Reference Information

Brand Name/s Holley
StreetFX SKU hly97-321
SFX Item ID 4784732
Supplier Item Code 4784732
Manufacturer SKU 97-321
Manufacturer UPC 90127068991
Alternative References HOL97-321, in.-20, 12-Point, 6.5-8.1L

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year1942
    Ending Year1963
    Engine TypeV8
    Engine Size7.0L/427
    Engine FamilyChevy big block W-engines
  • MakeCHEVROLET
    Beginning Year1958
    Ending Year1961
    Engine TypeV8
    Engine Size5.7L/348
    Engine FamilyChevy big block W-engines
  • MakeCHEVROLET
    Beginning Year1961
    Ending Year1965
    Engine TypeV8
    Engine Size6.7L/409
    Engine FamilyChevy big block W-engines
  • MakeCHEVROLET
    Beginning Year1965
    Ending Year1970
    Engine TypeV8
    Engine Size6.5L/396
    Engine FamilyChevy big block Mark IV
  • MakeCHEVROLET
    Beginning Year1966
    Ending Year1969
    Engine TypeV8
    Engine Size7.0L/427
    Engine FamilyChevy big block Mark IV
  • MakeCHEVROLET
    Beginning Year1970
    Ending Year1972
    Engine TypeV8
    Engine Size6.6L/402
    Engine FamilyChevy big block Mark IV
  • MakeCHEVROLET
    Beginning Year1970
    Ending Year1990
    Engine TypeV8
    Engine Size7.4L/454
    Engine FamilyChevy big block Mark IV
  • MakeCHEVROLET
    Beginning Year1991
    Ending Year1995
    Engine TypeV8
    Engine Size7.4L/454
    Engine FamilyChevy big block Gen V
  • MakeCHEVROLET
    Beginning Year1996
    Ending Year2000
    Engine TypeV8
    Engine Size7.4L/454
    Engine FamilyChevy big block Gen VI
  • MakeCHEVROLET
    Beginning Year2001
    Ending Year2007
    Engine TypeV8
    Engine Size8.1L/496
    Engine FamilyChevy big block Gen VII

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