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Holley 20-186BK GM LS Engine Mid-Mount Accessory System, Black

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Holley 20-186BK GM LS Engine Mid-Mount Accessory System, Black
Holley

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#42520186BK

Holley 20-186BK GM LS Engine Mid-Mount Accessory System, Black

$2,068.95

/kit

Factory Shipped

$2,299.95

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Product Summary

Universal Fit, Crankshaft Pulley Included

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    Key Specs

    Pulley StyleSerpentine
    Crankshaft Pulley IncludedYes
    Crankshaft Pulley MaterialSteel
    Crankshaft Pulley FinishBlack Painted
    Crankshaft Pulley Grooves6-groove, serpentine
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    855.313.9176
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    Holley 20-186BK Details

    HOLLEY MID-MOUNT RACE ACCESSORY SYSTEM-BLACK FINISH

    LS Engine Drive includes Alternator, P/S Pump, Tensioner, Crank Damper, Belt, & Pulleys

    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 compact and reliable Type II P/S pump with baffled reservoir are also integrated.

    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, P/S pump with reservoir, and the crank damper. All pulleys and the belt are supplied. Even heater hose adapters, power steering to -6 AN hardline, 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.

    The Premium Mid-Mount system comes with dress up pulley covers and an SFI certified damper. Partnered with this damper is a billet 6061-T6 aluminum hard anodized crank pulley. This system is ready for the racetrack if you want to play or just be ready for anything on the street.

    Features:

  • 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
  • Type II power steering pump with baffled reservoir
  • P/S adapter hardline to AN -6 adapter included
  • 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.

    • Charts

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    Holley Heritage Sale 10% Off Select Parts

    HOLLEYHERITAGE10%OFF2026

    Holley Heritage 10% Off Select Parts Sale, running from July 6, 2026, through July 31, 2026. For a limited time, customers can save 10% off on select parts, making it the perfect opportunity to upgrade your vehicle with high-quality components. Sale prices apply to purchases made during the sale period only. No rainchecks or exceptions will be provided. This sale cannot be combined with any other offers, discounts, or promotions.

    Holley 20-186BK Specifications

    KEY SPECS
    MFG. Part #20-186BK
    BrandHolley
    Pulley StyleSerpentine
    Crankshaft Pulley IncludedYes
    Crankshaft Pulley MaterialSteel
    Crankshaft Pulley FinishBlack Painted
    Crankshaft Pulley Grooves6-groove, serpentine
    Water Pump IncludedYes
    Water Pump MaterialCast Aluminum
    Water Pump FinishBlack Painted
    Water Pump Pulley IncludedYes
    Water Pump Pulley MaterialSteel
    Water Pump Pulley GroovesNon-ribbed
    Power Steering Pump IncludedYes
    Power Steering Pump Bracket FinishBlack Painted
    Power Steering Pump Brackets IncludedYes
    Power Steering Pump Bracket MaterialCast Aluminum
    Power Steering Pump FinishNatural
    Power Steering Pump Reservoir FinishBlack Powder Coated
    Power Steering Pump Reservoir IncludedYes
    Power Steering Pump Reservoir MaterialPlastic
    Power Steering Pump Reservoir StyleIntegral
    Power Steering Pump StyleType 2
    Power Steering Pulley AttachmentPress Fit
    Power Steering Pulley FinishBlack Painted
    Power Steering Pulley Grooves6-groove, serpentine
    Power Steering Pulley IncludedYes
    Power Steering Pulley MaterialSteel
    Alternator IncludedYes
    Alternator MaterialSteel
    Alternator FinishBlack Painted
    Alternator Amperage150 amp
    One Wire AlternatorYes
    Alternator Pulley FinishBlack Painted
    Alternator Pulley Grooves6-groove, Serpentine
    Alternator Pulley IncludedYes
    Alternator Pulley MaterialSteel
    Alternator Bracket FinishBlack painted
    Alternator Bracket MaterialCast Aluminum
    Alternator Brackets IncludedYes
    A/C Compressor IncludedNo
    A/C Pulley IncludedNo
    A/C Bracket IncludedNo
    Idler Brackets IncludedYes
    Idler IncludedYes
    Tensioner IncludedYes
    Tensioner StyleSpring-loaded
    Tensioner Cover IncludedNo
    Hardware IncludedYes
    GENERAL
    Sold in QuantityKit
    GTIN Code090127053539

    Questions & Answers

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    Fitment

    • GM LM4

    • GM LS6

    • GM LS2

    • GM LSA

    • GM LM7

    • GM LQ9

    • 6.2 Chevy LS V8

    • GM LM7

    • GM LQ9

    • 6.2 Chevy LS V8

    • GM LM7

    • GM LQ9

    • 6.2 Chevy LS V8

    • GM L76

    • GM LC9

    • GM LMG

    • GM LY5

    • GM LY5

    • GM LM7

    • 4.8 Chevy LS V8

    • GM LM7

    • GM LQ4

    • GM LS1

    • GM LS3

    • GM LS1

    • GM LS1

    • GM LS6

    • GM LS2

    • GM LS3

    • GM LS4

    • GM LS4

    • 4.8 Chevy LS V8

    • GM LM7

    • 4.8 Chevy LS V8

    • GM L20

    • GM LM7

    • GM LY2

    • 4.8 Chevy LS V8

    • GM LM7

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ9

    • GM LQ4

    • GM LM7

    • GM LQ4

    • GM LQ9

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LS3

    • GM LM4

    • GM LMG

    • GM LY5

    • GM LM7

    • GM L59

    • GM LM7

    • GM LC9

    • GM LMG

    • GM LY5

    • GM LC9

    • GM LMG

    • GM LMG

    • GM LY5

    • GM LQ4

    • GM LMG

    • GM LY5

    • 4.8 Chevy LS V8

    • GM L59

    • GM LM7

    • 4.8 Chevy LS V8

    • GM LMG

    • GM LY5

    • 6.2 Chevy LS V8

    • GM LC9

    • GM LMG

    • GM LC9

    • GM LMG

    • GM LMG

    • GM LY5

    • GM LH6

    • GM LS2

    • GM LM4

    • GM LM4

    • GM LM4

    • 4.8 Chevy LS V8

    • GM LM7

    • GM LQ4

    • 4.8 Chevy LS V8

    • GM L33

    • GM LM7

    • GM LQ4

    • 4.8 Chevy LS V8

    • GM L33

    • GM LQ4

    • 4.8 Chevy LS V8

    • GM LM7

    • GM LQ4

    • 4.8 Chevy LS V8

    • GM L33

    • GM LQ4

    • 4.8 Chevy LS V8

    • GM LM7

    • GM LQ4

    • 4.8 Chevy LS V8

    • GM L33

    • GM LQ4

    • GM L20

    • GM LC9

    • GM LMG

    • GM L33

    • GM L59

    • GM LM7

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LM7

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • 4.8 Chevy LS V8

    • GM L20

    • GM LM7

    • GM LY2

    • GM LC9

    • GM LMG

    • GM LM7

    • GM L59

    • GM LM7

    • GM LQ4

    • GM LQ4

    • GM LQ4

    • 6.2 Chevy LS V8

    • GM LH8

    • GM LH8

    • GM LS1

    • GM LS3

    • GM LS1

    • GM LS2

    Customer Impersonation Script