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

#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

$2,499.95

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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

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Key Specs

Pulley Style	Serpentine
Crankshaft Pulley Included	Yes
Crankshaft Pulley Material	Cast Aluminum
Crankshaft Pulley Finish	Black Painted
Crankshaft Pulley Grooves	6-groove, serpentine

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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

Holley Black Mid-Mount Complete Accessory System (PDF)

Guides & Documents

Accessory Drive Kits Installation Instructions (42520185BK)

CA WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

Holley 20-185BK Specifications

KEY SPECS
MFG. Part #	20-185BK
Brand	Holley
Pulley Style	Serpentine
Crankshaft Pulley Included	Yes
Crankshaft Pulley Material	Cast Aluminum
Crankshaft Pulley Finish	Black Painted
Crankshaft Pulley Grooves	6-groove, serpentine
Water Pump Included	Yes
Water Pump Material	Cast Aluminum
Water Pump Finish	Black Painted
Water Pump Pulley Included	Yes
Water Pump Pulley Material	Steel
Water Pump Pulley Grooves	Non-ribbed
Power Steering Pump Bracket Finish	Black Painted
Power Steering Pump Finish	Natural
Power Steering Pump Reservoir Included	Yes
Power Steering Pump Reservoir Material	Plastic
Power Steering Pump Reservoir Style	Integral
Power Steering Pump Style	Type 2
Power Steering Pulley Attachment	Press Fit
Power Steering Pulley Grooves	6-groove, serpentine
Power Steering Pulley Included	Yes
Power Steering Pulley Material	Steel
Alternator Material	Cast Aluminum
Alternator Finish	Black Painted
Alternator Amperage	150 amp
Alternator Pulley Grooves	6-groove, Serpentine
Alternator Pulley Included	Yes
Alternator Bracket Finish	Black painted
Alternator Bracket Material	Cast Aluminum
Alternator Brackets Included	Yes
A/C Compressor Finish	Black Painted
A/C Compressor Included	Yes
A/C Compressor Type	Sanden SD-7
Idler Brackets Included	Yes
Idler Included	No
Tensioner Included	Yes
Tensioner Style	Spring-loaded
Tensioner Cover Included	No
Hardware Included	Yes

GENERAL
Notes	Belt Included. Fits all LS except those equipped with supercharger or dry-sump system.
Sold in Quantity	Kit
GTIN Code	090127029480

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Questions & Answers

1 Question • 1 Answer

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What is the inlet and outlet hose size for this Holley kit?

by Dagwood

• 9 months ago

1 answer

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Fitment

2004 Buick Rainier

GM LM4

2004-2005 Cadillac CTS

GM LS6

2006-2007 Cadillac CTS

GM LS2

2002-2011 Cadillac Escalade

GM LM7
GM LQ9

2012 Cadillac Escalade

6.2 Chevy LS V8

2015-2020 Cadillac Escalade

6.2 Chevy LT V8

2003-2006 Cadillac Escalade ESV

GM LM7
GM LQ9

2007-2012 Cadillac Escalade ESV

6.2 Chevy LS V8

2015-2020 Cadillac Escalade ESV

6.2 Chevy LT V8

2002-2006 Cadillac Escalade EXT

GM LM7
GM LQ9

2007-2012 Cadillac Escalade EXT

6.2 Chevy LS V8

2007-2011 Chevy Avalanche

GM L76
GM LC9
GM LMG
GM LY5

2012-2013 Chevy Avalanche

GM LY5

2002-2006 Chevy Avalanche 1500

GM LM7

2000-2002 Chevy C1500

4.8 Chevy LS V8
GM LM7
GM LQ4

1998-2002 Chevy Camaro

GM LS1

2010-2014 Chevy Camaro

GM LS3

1997-2000 Chevy Corvette

GM LS1

2001-2004 Chevy Corvette

GM LS1
GM LS6

2005-2007 Chevy Corvette

GM LS2

2008-2013 Chevy Corvette

GM LS3

2006-2009 Chevy Impala

GM LS4

2006-2007 Chevy Monte Carlo

GM LS4

1999 Chevy Silverado 1500

4.8 Chevy LS V8
GM LM7

2000-2011 Chevy Silverado 1500

4.8 Chevy LS V8
GM L20
GM LM7
GM LY2

2012-2014 Chevy Silverado 1500

4.8 Chevy LS V8
GM LM7

2015-2023 Chevy Silverado 1500

5.3 Chevy LT V8
6.2 Chevy LT V8

2007 Chevy Silverado 1500 Classic

GM LQ4

2001-2003 Chevy Silverado 1500 HD

GM LQ4

2005-2006 Chevy Silverado 1500 HD

GM LQ4

2007 Chevy Silverado 1500 HD

GM LQ9

2007 Chevy Silverado 1500 HD Classic

GM LQ4

2000-2004 Chevy Silverado 2500

GM LM7
GM LQ4

2005 Chevy Silverado 2500

GM LQ9

2001-2011 Chevy Silverado 2500 HD

GM LQ4

2007 Chevy Silverado 2500 HD Classic

GM LQ4

2001-2006 Chevy Silverado 3500

GM LQ4

2007 Chevy Silverado 3500 Classic

GM LQ4

2007-2011 Chevy Silverado 3500 HD

GM LQ4

2014-2017 Chevy SS

GM LS3

2003-2004 Chevy SSR

GM LM4

2014 Chevy Suburban

GM LMG
GM LY5

2015 Chevy Suburban

5.3 Chevy LT V8
6.2 Chevy LT V8

2018-2023 Chevy Suburban

5.3 Chevy LT V8
6.2 Chevy LT V8

2000-2001 Chevy Suburban 1500

GM LM7

2002-2006 Chevy Suburban 1500

GM L59
GM LM7

2007-2009 Chevy Suburban 1500

GM LC9
GM LMG
GM LY5

2010-2011 Chevy Suburban 1500

GM LC9
GM LMG

2012-2014 Chevy Suburban 1500

GM LMG
GM LY5

2000-2006 Chevy Suburban 2500

GM LQ4

2012-2013 Chevy Suburban 2500

GM LMG
GM LY5

2016-2019 Chevy Suburban 3500 HD

5.3 Chevy LT V8
6.2 Chevy LT V8

2000-2006 Chevy Tahoe

4.8 Chevy LS V8
GM L59
GM LM7

2007 Chevy Tahoe

4.8 Chevy LS V8
GM LMG
GM LY5

2008 Chevy Tahoe

6.2 Chevy LS V8
GM LC9
GM LMG

2009-2011 Chevy Tahoe

GM LC9
GM LMG

2012-2014 Chevy Tahoe

GM LMG
GM LY5

2015-2023 Chevy Tahoe

5.3 Chevy LT V8
6.2 Chevy LT V8

2002-2005 Chevy Trailblazer

GM LH6

2006-2009 Chevy Trailblazer

GM LS2

2002-2009 GMC Envoy

GM LM4

2002-2006 GMC Envoy XL

GM LM4

2004-2005 GMC Envoy XUV

GM LM4

2001-2005 GMC Savana 1500

4.8 Chevy LS V8
GM LM7
GM LQ4

2006 GMC Savana 1500

4.8 Chevy LS V8
GM L33
GM LM7
GM LQ4

2007-2014 GMC Savana 1500

4.8 Chevy LS V8
GM L33
GM LQ4

2001-2005 GMC Savana 2500

4.8 Chevy LS V8
GM LM7
GM LQ4

2006-2013 GMC Savana 2500

4.8 Chevy LS V8
GM L33
GM LQ4

2014-2019 GMC Savana 2500

5.3 Chevy LT V8

2002-2005 GMC Savana 3500

4.8 Chevy LS V8
GM LM7
GM LQ4

2006-2013 GMC Savana 3500

4.8 Chevy LS V8
GM L33
GM LQ4

2014-2019 GMC Savana 3500

5.3 Chevy LT V8

2019 GMC Sierra

5.3 Chevy LT V8

1999-2011 GMC Sierra 1500

GM L20
GM LC9
GM LMG

2012-2013 GMC Sierra 1500

5.3 Chevy LT V8
6.2 Chevy LT V8

2014-2023 GMC Sierra 1500

5.3 Chevy LT V8

2007 GMC Sierra 1500 Classic

GM L33
GM L59
GM LM7

2001-2003 GMC Sierra 1500 HD

GM LQ4

2005-2006 GMC Sierra 1500 HD

GM LQ4

2007 GMC Sierra 1500 HD

5.3 Chevy LT V8

2007 GMC Sierra 1500 HD Classic

GM LQ4

2019 GMC Sierra 1500 Limited

5.3 Chevy LT V8

1999-2001 GMC Sierra 2500

GM LM7
GM LQ4

2002-2004 GMC Sierra 2500

GM LQ4

2001-2011 GMC Sierra 2500 HD

GM LQ4

2007 GMC Sierra 2500 HD Classic

GM LQ4

2001-2006 GMC Sierra 3500

GM LQ4

2007 GMC Sierra 3500 Classic

GM LQ4

2001 GMC Sierra C3

GM LQ4

2000-2011 GMC Yukon

4.8 Chevy LS V8
GM L20
GM LM7
GM LY2

2012-2013 GMC Yukon

GM LC9
GM LMG

2014-2022 GMC Yukon

5.3 Chevy LT V8
6.2 Chevy LT V8

2023 GMC Yukon

5.3 Chevy LT V8

2015-2020 GMC Yukon XL

5.3 Chevy LT V8

2000 GMC Yukon XL 1500

GM LM7

2001-2011 GMC Yukon XL 1500

GM L59
GM LM7
GM LQ4

2000-2011 GMC Yukon XL 2500

GM LQ4

2003-2007 Hummer H2

GM LQ4

2008-2009 Hummer H2

6.2 Chevy LS V8

2008-2009 Hummer H3

GM LH8

2009 Hummer H3T

GM LH8

1998-2002 Pontiac Firebird

GM LS1

2009 Pontiac G8

GM LS3

2004 Pontiac GTO

GM LS1

2005-2006 Pontiac GTO

GM LS2