Holley Mid-Mount Complete Accessory Drive System for LT Engines -Black

Complete GM Gen V LT Accessory Drive System w/ Alt, P/S, A/C, Water Pump, Belts, and crankshaft damper with Black Finish

Part # 20-205BK Be the first to write a review
Estimated Ship Date: 03/17/2023
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Vehicle emissions regulations are not applicable to this item.

See Emissions 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 the C7 Corvette. The compact and reliable SD7 A/C compressor and Type II P/S pump with a baffled reservoir. 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 along with heater hose adapters, a power steering hardline, and the alternator pigtail harness. Ultra easy assembly with color graphic instructions to walk you through the installation. Patent -


  • Bracketless accessory mounting with ultra-easy assembly
  • Bottom outlet heater hose options for swap application clearance
  • LT1 style premium alternator
  • LT1 style water pump design
  • Compact SD7 A/C compressor
  • Type II power steering pump with baffled reservoir
  • P/S, A/C adapter hardline to AN -6 adapter included
  • Shortened top outlet nipple for more radiator hose turns and routing room
  • OE pulley ratios for optimal accessory performance
  • No adapters/spacers are required
  • Works with all common aftermarket and factory throttle bodies and intakes
  • Works with Hooker turbo manifolds
  • All accessories are included; the water pump, A/C compressor, Alternator, P/S pump with reservoir, and the crank damper
  • LT Mid-Mount drives fit ALL wet-sump LT V6 & V8 engines (except LT2 and any supercharged). Also, will fit dry sump LT engines converted to wet-sump (except LT2 and any supercharged)

About Holley

Holley Performance Products has been the undisputed leader in fuel systems for over 100 years. Holley's products include carburetors, fuel pumps, fuel injection, intake manifolds, and much more. From start to finish, Holley has the parts to make your dream a reality.

A/C Compressor IncludedYes
A/C Compressor TypeSD7
Accessory Drive StyleMid Mount
Alternator Amperage150
Alternator IncludedYes
ApplicationGM Gen V LT
Belt IncludedYes
Brand Holley
Choose Your PartAccessory Drive Kits
Damper IncludedYes
Damper StyleCast Damper
Emission Code6
EngineGM Gen V LT1
Inlet Size35.4mm/1.4"
MaterialCast Aluminum
Oil System TypeWet Sump
Output150 Amps
Power Steering Hardline IncludedYes
Power Steering Pulley IncludedYes
Power Steering Pump IncludedYes
Power Steering Reservoir IncludedYes
Product TypeAccessory Drive Kits
Pulley StyleSerpentine
Tensioner IncludedYes
Thermostat IncludedYes
WarrantyLimited 90 Day
Water Neck IncludedYes
Water Pump IncludedYes
Water Pump Pulley IncludedYes
Part Number20-205BK

Vehicle emissions regulations are not applicable to this item.
Fits: GM Gen-V LT Engines (wet-sump), LV3/LV1 (V6 version of Gen-V LT engine), dry-sump LT engines converted to wet-sump (except LT2 and any supercharged). Optional A/C pulley cover (97-185) and Alternator pulley cover (97-187) are available separately.
Limited 90 Day: See Details

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      Some parts are not legal for use in California or other states with similar regulations.