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Holley 20-185 Mid-Mount Complete Accessory System, LS Engine

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Holley 20-185 Mid-Mount Complete Accessory System, LS Engine
Holley

|

#42520185

Holley 20-185 Mid-Mount Complete Accessory System, LS Engine

  • Features bracketless accessory mounting with ultra-easy assembly
  • This complete accessory system is specially designed of the LS engine
  • Comes with bottom outlet heater hose options for swap application clearance
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$2,350.95

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$2,612.95

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Product Summary

  • Features bracketless accessory mounting with ultra-easy assembly
  • This complete accessory system is specially designed of the LS engine
  • Comes with bottom outlet heater hose options for swap application clearance
  • Has shortened top outlet nipple for more radiator hose turns and routing room
  • Will work with all common aftermarket and factory throttle bodies and intakes

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Key Specs

MFG. Part #20-185
BrandHolley
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Holley 20-185 Details

Holley's Mid-Mount complete accessory system makes use of a compact system for mounting accessories compared to other accessory drives.  All accessories mount directly to the water pump, making a virtually bracketless system while giving the whole system a cleaner look. 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.

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. 

  • Bracketless accessory mounting with ultra-easy assembly
  • Bottom outlet heater hose options for swap application clearance
  • LT1 style hairpin premium 150 amp alternator
  • LT1 style water pump cartridge 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.

 

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 20-185 Specifications

KEY SPECS
MFG. Part #20-185
BrandHolley
GENERAL
GTIN Code090127029473

Ratings & Reviews

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Look No Further - This Is The Accessory Kit For You

5.0

3 years ago

KS80537

Loveland, CO

Our project is a 1980 Camaro / LS3 E-Rod swap. The 20-185 Holley kit is excellent. Great, tight-but-not-too-tight location of accessories. No clearance problems anywhere, with one minor exception; the vapor purge solenoid could no longer be mounted on the front of the engine where Chevy says to mount it. No biggie; it looks better mounted on the firewall anyway. We didn't have to use a remote power steering reservoir; we did have a custom high-pressure hose made locally to go between pump and steering gearbox. A steam port inlet on the back of the water pump enabled us to have super-clean, nearly-invisible routing of the steam tube from each head. The instructions are very high quality (and light years better than their carburetor rebuild instructions). Based on several phone calls (some for how-to, and one for a minor issue with the kit), Holley's customer service is the best I've dealt with. They ALWAYS answer my emails. I would use Holley for the quality of their customer service alone, though it had nothing to do with why I initially chose this kit.

Would Recommend

Showing 1 of 1 reviews

Fitment

  • GM LM4

  • GM LS6

  • GM LS2

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • GM L9H

  • GM L94

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • GM L9H

  • GM L94

  • GM LM7

  • GM LQ9

  • 6.2 Chevy LS V8

  • GM L9H

  • 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 L77

  • 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 L96

  • 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 L9H

  • GM LC9

  • GM LMG

  • GM L9H

  • 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 L94

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM L94

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM L94

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM LM7

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L33

  • GM L94

  • GM LQ4

  • GM L20

  • GM L9H

  • 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 L96

  • GM LQ4

  • GM LQ4

  • GM L96

  • GM LQ4

  • GM L96

  • GM L96

  • GM LQ4

  • 4.8 Chevy LS V8

  • GM L20

  • GM LM7

  • GM LY2

  • 4.8 Chevy LS V8

  • GM L20

  • GM L94

  • GM LM7

  • GM LY2

  • GM L94

  • GM LC9

  • GM LMG

  • GM LM7

  • GM L59

  • GM LM7

  • GM LQ4

  • GM L96

  • GM LQ4

  • GM L96

  • GM LQ4

  • 6.2 Chevy LS V8

  • GM LH8

  • GM LH9

  • GM LH8

  • GM LH9

  • GM LS1

  • GM LS3

  • GM LS1

  • GM LS2

Customer Impersonation Script