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Holley

HOLLEY LS Mid-Mount Complete Engine Accessory System

MPN: 20-185 Catalog #: 001509256 Category: Pulley Kits Check Vehicle Fitment

Product Details

Pulley Kit - 6-Rib Serpentine - Cast Aluminum - Natural - GM LS-Series - Kit

Accessory Drive System Kit; Natural Finish; GM LS; Mid-Mount; Bracketless; Incl. SD7 A/C Compressor/Alternator/P.Steering Pump/Crank Damper/Tensioner/Belt/Pulleys/Hose Adapters;

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 (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 hairpin/square wire, 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.

DETAILS:

Part Number 20-185 SPECS:

DETAILS:

  • Holley Performance Emission Code 5: This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled (Non-Emissions Controlled) Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
  • Accessory Drive Component Mount Set
  • Accessory Drive System Kit
  • Bottom Outlet Heater Hose Options For Swap Appls. Clearance
  • Compact SD7 A/C Compressor
  • Fits All LS Engines Except With Dry Sump and/or Supercharger
  • LT1 Style Hairpin Premium Alternator
  • LT1 Style Water Pump Design
  • No Adapters/Spacers Require
  • OE Pulley Ratios For Optimal Accessory Performance
  • PS Adapter Hardline to AN-6 Adapter Included
  • Shortened Top Outlet Nipple For More Hose Turns/Routing Room
  • Steam Tube Input Port
  • Type II Power Steering Pump w/Baffled Reservoir
  • Ultra-Easy Assembly
  • COMP MID-MT ACC SYSTEM; LS-NATURAL
  • AccessoryDriveCmpSet

Part Number 20-185 SPECS:

  • Accessory Drive Style: Mid Mount
  • Engine Make/Size: GM LS
  • Material: Cast Aluminum
  • WARNING CA Proposition 65: No

Vehicle Fitment

Universal or product-specific fitment. Please review the product details and contact us if you need help confirming fitment before ordering.

Engine Compatibility

GM - LSMatched variant: LS

GM Gen III/IV V8; LS1/LS2/LS3/LS6/LS7/LS9/LSA/LSX

Fitment note: Engine compatibility is provided as a guide. Please verify all fitment details before ordering.

Product Specs

Brand
Holley
Part Number
20-185
Catalog Number
001509256
Product Line
Pulley Kits
Category
Engines & Parts
Type
Pulley Kits
UPC / Barcode
090127029473
Length
24.50 in
Width
18.50 in
Height
17.00 in
Weight
72.00 lb
Ship Alone
Yes
Air Restricted
No

Shipping & Availability

Current status 2 Available - Ready to ship
Estimated timing Usually ships within 24hrs

This item is showing available inventory. Most in-stock performance parts ship quickly, but timing can vary by warehouse, vendor cut-off time, holidays, and carrier pickup.

Inventory shown: 2 available as of 6/3/2026.

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