Talk to the experts. Call 800.979.0122, 7am-10pm CST, everyday.

REWARDS

GIFT CARDS

DEALS

TRACK ORDER

HELP CENTER

My

List

Menu

Shop

Garage

Cart

Account

Rebate

Holley 20-185BK LS Engine Accessory Drive Kit, Mid Mount

Rebate

Holley 20-185BK LS Engine Accessory Drive Kit, Mid Mount
Holley

|

#42520185BK

Holley 20-185BK LS Engine Accessory Drive Kit, Mid Mount

  • It fits all LS engines except with dry sump and/or supercharger
  • Features bracket less accessory mounting with ultra-easy assembly
  • Has bottom outlet heater hose options for swap application clearance
See More

$2,489.95

/each

In Stock

$2,766.95

Save $277.00


Quantity

Need Help? Call to Order

Add to a list

Share

Select an engine to verify Fitment

Select Engine

Product Summary

Crankshaft Pulley Included, Water Pump Included

  • It fits all LS engines except with dry sump and/or supercharger
  • Features bracket less accessory mounting with ultra-easy assembly
  • Has bottom outlet heater hose options for swap application clearance
  • Includes a LT1 style premium 150 amp alternator and water pump cartridge design
  • Designed to work with all common aftermarket and factory throttle bodies and intakes

Rebates Available

See rebate details
See more details

Key Specs

Pulley StyleSerpentine
Crankshaft Pulley IncludedYes
Crankshaft Pulley MaterialCast Aluminum
Crankshaft Pulley FinishBlack Painted
Crankshaft Pulley Grooves6-groove, serpentine
See more specs

Need To Know

Need help?

855.313.9176
View the Help Center

Quick and Easy Returns

Return Policy

Holley 20-185BK Details

Holley's 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, 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 SD7 A/C compressor and 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, A/C compressor, 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.

  • 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 cartidge design
  • Compact SD7 A/C compressor
  • 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.
  • Black Finish
  • All accessories are included; the water pump, A/C compressor, Alternator, P/S pump with reservoir, and the crank damper.

Charts

Rebates

Holley Fuel Up Spring Savings Event 2026

Save 10% instantly on select products across the Holley family of performance brands during the annual Holley Fuel Up Spring Savings Event 2026. Instant rebate period runs from March 30, 2026 through April 19, 2026.

Holley 20-185BK Specifications

KEY SPECS
MFG. Part #20-185BK
BrandHolley
Pulley StyleSerpentine
Crankshaft Pulley IncludedYes
Crankshaft Pulley MaterialCast Aluminum
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 Bracket FinishBlack Painted
Power Steering Pump FinishNatural
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 Grooves6-groove, serpentine
Power Steering Pulley IncludedYes
Power Steering Pulley MaterialSteel
Alternator MaterialCast Aluminum
Alternator FinishBlack Painted
Alternator Amperage150 amp
Alternator Pulley Grooves6-groove, Serpentine
Alternator Pulley IncludedYes
Alternator Bracket FinishBlack painted
Alternator Bracket MaterialCast Aluminum
Alternator Brackets IncludedYes
A/C Compressor FinishBlack Painted
A/C Compressor IncludedYes
A/C Compressor TypeSanden SD-7
Idler Brackets IncludedYes
Idler IncludedNo
Tensioner IncludedYes
Tensioner StyleSpring-loaded
Tensioner Cover IncludedNo
Hardware IncludedYes
GENERAL
NotesBelt Included. Fits all LS except those equipped with supercharger or dry-sump system.
Sold in QuantityKit
GTIN Code090127029480

Fitment

  • GM LM4

  • GM LS6

  • GM LS2

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • 6.2 Chevy LT V8

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • 6.2 Chevy LT 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

  • 5.3 Chevy LT V8

  • 6.2 Chevy LT V8

  • 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

  • 5.3 Chevy LT V8

  • 6.2 Chevy LT V8

  • 5.3 Chevy LT V8

  • 6.2 Chevy LT V8

  • 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

  • 5.3 Chevy LT V8

  • 6.2 Chevy LT V8

  • 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

  • 5.3 Chevy LT V8

  • 6.2 Chevy LT V8

  • 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

  • 5.3 Chevy LT V8

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM LQ4

  • 5.3 Chevy LT V8

  • 5.3 Chevy LT V8

  • GM L20

  • GM LC9

  • GM LMG

  • 5.3 Chevy LT V8

  • 6.2 Chevy LT V8

  • 5.3 Chevy LT V8

  • GM L33

  • GM L59

  • GM LM7

  • GM LQ4

  • GM LQ4

  • 5.3 Chevy LT V8

  • GM LQ4

  • 5.3 Chevy LT V8

  • 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

  • 5.3 Chevy LT V8

  • 6.2 Chevy LT V8

  • 5.3 Chevy LT V8

  • 5.3 Chevy LT V8

  • 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