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  • Mid-Mount Race Accessory System LS Engine Drive Includes Alternator, Tensioner, Crank Damper, Belt, & Pulleys Holley
  • Mid-Mount Race Accessory System LS Engine Drive Includes Alternator, Tensioner, Crank Damper, Belt, & Pulleys Holley
  • Mid-Mount Race Accessory System LS Engine Drive Includes Alternator, Tensioner, Crank Damper, Belt, & Pulleys Holley
  • Mid-Mount Race Accessory System LS Engine Drive Includes Alternator, Tensioner, Crank Damper, Belt, & Pulleys Holley
    • 20-187_0118320.jpg
    • 20-180_on18320.jpg
    • Mid-Mount Race Accessory System LS Engine Drive Includes Alternator, Tensioner, Crank Damper, Belt, & Pulleys Holley
    • Mid-Mount Race Accessory System LS Engine Drive Includes Alternator, Tensioner, Crank Damper, Belt, & Pulleys Holley
    • Mid-Mount Race Accessory System LS Engine Drive Includes Alternator, Tensioner, Crank Damper, Belt, & Pulleys Holley
    • Mid-Mount Race Accessory System LS Engine Drive Includes Alternator, Tensioner, Crank Damper, Belt, & Pulleys Holley

    Holley Mid-Mount Race Accessory System, LS Engine with 150A Alternator & Crank Damper | 20-187

    Vendor: Holley
    Part Number: 20-187
    Save $269
    $2,149.95 $2,418.95

    Currently out of stock.

    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 Mid-Mount accessory system uses Holley's bracketless design bolted directly to the water pump for a clean, tight LS engine build without air conditioning or power steering. It includes a 150-amp alternator, cast crank damper, belt, and pulleys.

    Specifications:

    • Brand: Holley
    • Category: Belts and Cooling
    • Application: GM LS
    • Engine: GM Gen III/IV (LS)
    • Accessory Drive Style: Mid-Mount
    • Finish: Cast
    • Material: Cast Aluminum
    • Alternator Amperage: 150
    • Output: 150 Amps
    • Damper Style: Cast Damper
    • Pulley Style: Serpentine
    • Steam Tube Input Port: 1/8" NPT
    • Includes: water pump, alternator, crank damper, belt, and pulleys
    • Sub Category: Accessory Drive Belt System Components
    • Warranty: Manufacturer's Limited 90 Day Warranty
    • Part Number: 20-187

    Fits all LS engines except those with dry sump and/or supercharger.

    FAQ

    What's included in this kit?

    Water pump, alternator, crank damper, belt, and pulleys — no A/C or power steering.

    What is the alternator output?

    150 amps, using 6-phase technology.

    What size is the steam tube input port?

    1/8" NPT.

    What engines does it fit?

    All LS engines, except those with dry sump and/or supercharger.

    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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