• Installation Kit for Low LS Accessory Drive Bracket W/ Long Alignment Installation Kit, Low LS Acc Drive Brackets, Use with Long Belt Alignment & Bracket 20-155 (alignment Common on Trucks & '10-UP Camaro) Holley
    • Installation Kit for Low LS Accessory Drive Bracket W/ Long Alignment Installation Kit, Low LS Acc Drive Brackets, Use with Long Belt Alignment & Bracket 20-155 (alignment Common on Trucks & '10-UP Camaro) Holley
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    Holley Low-Mount LS Accessory Drive Installation Kit, Long Belt Alignment | 21-4

    Vendor: Holley
    Part Number: 21-4
    Save $15
    $112.95 $127.95

    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 Holley installation kit provides proper spacing for Low LS accessory drive brackets (bracket 20-155) with long belt alignment, so accessory belts ride at the correct distance on GM LS-based engines.

    Specifications:

    • Accessory Drive Style: Low-Mount
    • Belt Alignment: Long
    • Engine Fitment: GM Gen III/IV (LS)
    • Material: Aluminum
    • Finish: Cast
    • Part Number: 21-4

    Fits Middle and Long accessory spacing only — does not fit Short accessory spacing (Corvette/CTS-V/G8). Long spacing (alignment common on trucks and 2010-up Camaro) requires this installation kit. Customers with short spacing can swap the water pump and crank pulley to convert to middle or long spacing.

    FAQ

    What engines does the 21-4 kit fit?

    It's designed for GM Gen III/IV (LS) engines using Holley's low-mount accessory drive system.

    Does the 21-4 kit fit all LS accessory drive spacing?

    No, it fits Middle and Long accessory spacing only — it does not fit Short accessory spacing found on Corvette, CTS-V, or G8.

    What is this kit made from?

    It's cast aluminum.

    Can a Short-spacing engine use the Long alignment kit?

    Customers with short spacing can swap the water pump and crank pulley to convert to middle or long spacing before using this kit.

    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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