SKU: 69036135052

Holley Harmonic Balancer Bolt - Chevy Big Block - 12-Point 97-321

Sale price$18.80 Regular price$20.89
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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17

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Description

Holley Harmonic Balancer Bolt - Chevy Big Block - 12-Point 97-321Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Big Block 396 454 with Holley Mid Mount Accessory Drive System 20 242 & 20 242BK Replacement harmonic balancer bolt with thick washer for Big Block Chevy Mid Mount Accessory drive system. 12 Point, 1 2" Wrench Size, 1 2" 20 x 2. 500" Under Head Length, Washer diameter 1. 5" x 0. 200" Thick. NOTES: Torque Harmonic Balancer Bolt to 85 ft lbs. Features: 180,000 PSI Rating (Grade 9) Made from

Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Big Block 396-454 with Holley Mid-Mount Accessory Drive System 20-242 & 20-242BK

Replacement harmonic balancer bolt with thick washer for Big Block Chevy Mid-Mount Accessory drive system. 12-Point, 1/2" Wrench Size, 1/2"-20 x 2.500" Under Head Length, Washer diameter 1.5" x 0.200" Thick.

NOTES: Torque Harmonic Balancer Bolt to 85 ft/lbs.

Features:

  • 180,000 PSI Rating (Grade 9)
  • Made from Steel
  • Black E-Coat Finish
  • 1/2" Wrench Size
  • 12-Point Bolt Head
  • Large Diameter Extra Thick Washer - .200" Thick x 1.5" Diameter
  • Reusable - Not Torque-To-Yield

Specs:

Bolt Grade 10.9
Brand Holley
Color Black
Emission Code 6
Engine Chevy Big Block V8
Finish Black E-Coat
Grade Type Performance
Head Drive Type 12 Point
Head Style 12-Point
Length 2.5Inch
Material Steel
Product Type Harmonic Balancer Bolts
PSI Rating 180,000
Reusable Yes
Thread Diameter 1/2Inch
Thread Pitch 20
Thread Size 1/2-20
Under Head Length 2.500"
Universal Or Specific Fit Universal
Washer Included Yes
Washer Size .200" Thick x 1.5" Diameter
Wrench Size 1/2"
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 69036135052

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Georgie Oldham
Natrona Heights, US
★★★★★ 3
My doggy no like!
Pattern Name: Star
My dog completely ignored them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
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Winter in the desert
Lexington, US
★★★★★ 5
Fun toy
Pattern Name: Checkered
This was a very fun toy but didn't last too long with our 1-year-old lab who is an aggressive chewer.
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Reviewed in the United States on April 27, 2026
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Verucat
Louisville, US
★★★★★ 5
Yes!
Size: Medium
Durable. Squeak doesn't last forever with my aggressive chewers but crinkle does. Best balls.
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Reviewed in the United States on September 28, 2025
J
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JJ Fording
Charlottesville, US
★★★★★ 5
Balls
Size: Medium
My dog loves chasing these balls. He seems to love the squeak! They fit the chuck it stick perfectly, and are great replacements for the originals that came with the stick.
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Reviewed in the United States on February 7, 2026
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Steve just Steve
Waukegan, US
★★★★★ 5
Nice set of balls
Size: Medium
The squeaker quickly became my dog’s favorite ball and has replaced the fuzzy tennis balls. My dog is a nonstop fetcher and these chuck it balls are durable and fun.
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Reviewed in the United States on January 9, 2026

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