Product Summary

Universal Fit, Crankshaft Pulley Included

    Key Specs

    MFG. Part #20-187
    Crankshaft Pulley IncludedYes
    Crankshaft Pulley MaterialBillet Aluminum
    Water Pump IncludedYes
    Water Pump FinishNatural

    Need To Know

    This Product Will Ship Free

    Shipping Policies & FAQs

    Quick and Easy Returns

    Return Policy

    Holley 20-187 Details

    Holley's Mid-Mount Accessory Drive System is now offered for the serious racer in mind. If you need a front drive system for your LS engine racecar, they are now available without air conditioning and power steering depending upon your needs!Holley's Premium Mid-Mount complete accessory system has all accessories pulled in tighter than other accessory drives. At the heart of the system is a "bracketless" design (Patent Pending), where the accessories bolt directly to the water pump for a clean, integrated form. The design offers superb engine visibility to show off your horsepower, not your accessories. Among the many swap friendly features are bottom heater outlets for clearance in tight applications. The Holley designed alternator is just as innovative. This premium alternator utilizes 6-phase technology as found on the C7 Corvette. The water pump also shares its design efficiencies with that of the C7 Corvette. The Mid-Mount drive completes Holley's trilogy of accessory solutions giving a third option compared to the High and Low-Mount previously released. All three accessory solutions are for LS engines.When we say "complete", we mean complete. The Mid-Mount system comes with everything you need. All accessories are included; the water pump, alternator, and the crank damper. All pulleys and the belt are supplied. Even heater hose adapters, and the alternator plug/harness are included. Easy assembly was a priority during the entire development of this accessory solution. Color graphical instructions walk you through every step of the ultra-easy installation. This system is ready for the racetrack if you want to play or just be ready for anything on the street.
    • Bracketless accessory mounting with ultra-easy assembly
    • Bottom outlet heater hose options for swap application clearance
    • LT1 style premium 150 amp alternator
    • LT1 style water pump cartridge design
    • Steam tube input port
    • Shortened top outlet nipple for more radiator hose turns and routing room
    • OE pulley ratios for optimal accessory performance
    • No adapters/spacers required!
    • Works with all common aftermarket and factory Throttle bodies and intakes.
    • Works with VVT applications
    • Works with Hooker turbo manifolds.
    • Fits ALL LS engines except with dry sump and/or supercharger.


    Holley 20-187 Specifications

    MFG. Part #20-187
    Crankshaft Pulley IncludedYes
    Crankshaft Pulley MaterialBillet Aluminum
    Water Pump IncludedYes
    Water Pump FinishNatural
    Water Pump Pulley IncludedYes
    Power Steering Pump IncludedYes
    Power Steering Pump FinishNatural
    Power Steering Pump Reservoir IncludedYes
    Power Steering Pulley IncludedYes
    Alternator IncludedYes
    Alternator FinishNatural
    Alternator Amperage150 amp
    Alternator Pulley IncludedYes
    A/C Pulley IncludedYes
    Hardware IncludedYes
    GTIN Code090127053096