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  • Harmonic Balancer Bolt Chevy Small Block 12-Point Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Small Block 283-400 with Mid-Mount Accessory Drive System 20-240 & 20-240BK Holley
  • Harmonic Balancer Bolt Chevy Small Block 12-Point Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Small Block 283-400 with Mid-Mount Accessory Drive System 20-240 & 20-240BK Holley
  • Harmonic Balancer Bolt Chevy Small Block 12-Point Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Small Block 283-400 with Mid-Mount Accessory Drive System 20-240 & 20-240BK Holley
    • e554d7707d3debe2120dcf539dd5f24f7fb94a53.jpg
    • 72c00f950c99fd844a30405cccbede28809f976d.jpg
    • e0532cd4840ddc6149ec77771762832744a812e3.jpg
    • Harmonic Balancer Bolt Chevy Small Block 12-Point Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Small Block 283-400 with Mid-Mount Accessory Drive System 20-240 & 20-240BK Holley
    • Harmonic Balancer Bolt Chevy Small Block 12-Point Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Small Block 283-400 with Mid-Mount Accessory Drive System 20-240 & 20-240BK Holley
    • Harmonic Balancer Bolt Chevy Small Block 12-Point Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Small Block 283-400 with Mid-Mount Accessory Drive System 20-240 & 20-240BK Holley
    Sale!

    Holley Harmonic Balancer Bolt, Chevy Small Block, 12-Point | 97-320

    Vendor: Holley
    Part Number: 97-320
    Save $2.61
    $20.89 $23.50

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
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    Product DetailsFAQReviewsRelated Products

    This replacement harmonic balancer bolt with an extra-thick washer is designed for Holley's Small Block Chevy mid-mount accessory drive systems 20-240 and 20-240BK, fitting 283-400 engines.

    Specifications:

    • Application: Chevy Small Block V8 (283-400), Holley Mid-Mount Accessory Drive 20-240/20-240BK
    • Thread Size: 7/16-20
    • Under Head Length: 2.800 in.
    • Head Style: 12-Point, 7/16 in. Wrench Size
    • Washer: .200 in. Thick x 1.5 in. Diameter, Included
    • PSI Rating: 180,000 (Grade 9)
    • Material/Finish: Steel, Black E-Coat
    • Reusable: Yes (Not Torque-to-Yield)
    • Part Number: 97-320

    Torque the harmonic balancer bolt to 60 ft-lbs.

    FAQ

    What accessory drive systems does this bolt fit?

    It's designed for Holley's Small Block Chevy mid-mount accessory drive systems 20-240 and 20-240BK on 283-400 engines.

    What torque spec should be used?

    Torque the bolt to 60 ft-lbs.

    Is this bolt reusable?

    Yes, it's a reusable design, not a torque-to-yield bolt.

    What is the PSI rating?

    It's rated at 180,000 PSI (Grade 9).

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy
    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy
    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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