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Holley Complete Mid Mount Accessory Drive System Natural Finish for 03-08 5.7L & 05-10 6.1L Gen III HEMI

Product Code: 20-290
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MSRP: $2,089.95
High Horse Performance is Veteran Owned & Operated
Holley's complete, mid-mount 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 timing cover for a clean, integrated system. The design offers superb engine visibility to show off your horsepower, not your accessories. Among the many swap friendly features are two optional heater connection configurations. The innovative Holley premium alternator incorporates 6-phase and square wire technology. The compact and reliable SD7 A/C compressor and Type II P/S pump with baffled reservoir are also integrated. The kit utilizes Holley's proven cartridge style water pump. 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 System for Ultra-Easy Assembly – Timing Cover is Integrated into this Bracket / Casting
  • Configurable Heater Hose Connection Options - for Hose Routing Flexibility
  • Holley Premium 150 Amp alternator – Plenty of Power for All Vehicle Systems
  • Easy Wiring of Alternator That Doesn’t Require Factory ECU to Excite Alternator
  • Alternator is Tucked in Tight to the Engine – Eliminates Frame Rail or Hood Clearance Issues (Common with Factory Car or Truck Drive Systems)
  • Holley Water Pump w/ Cartridge Design – Compact & Easy to Service Without Removing the Water Pump Housing / Timing Cover
  • SD7 A/C Compressor – Small Compact Compressor
  • Type II Power Steering Pump with Baffled Reservoir
  • Power Steering Pump Has Proper Pressure for use with Steering Box on Older Vehicles (Eliminates Steering Box Damage Due to Excessive Pressure)
  • Swivel Water Inlet & Outlet – Allows Custom Radiator Hose Routing
  • OE (Original Equipment) Pulley Ratios for Optimal Accessory Performance
  • No Adapters or Spacers Needed – for Easy Installation
  • Works with Common After-Market and Factory Throttle Bodies and Intakes
  • Choose from Kits in Natural Aluminum or Black Finish – Fits Naturally Aspirated Gen III Hemi Engines (5.7L, 6.1L, and 6.4L)
  • Includes OE Style Damper with Cast in Serpentine Pulley
  • All Accessories are Included; Water Pump, A/C Compressor, Alternator, Power Steering Pump w/ Reservoir, Pulleys & Crank Damper
  • All Plumbing Adapters, Wiring Adapters, Gaskets and Seals are Included
  • Available for VVT (Variable Valve Timing – 2009-Up 5.7L and 2011-Up 6.4L) and Non-VVT (2003-2008 5.7L, and 2005-2010 6.1L) Engines in Natural Cast Aluminum or Black Finish

Installation Instructions


A/C Compressor Included Yes
A/C Compressor Type SD7
Accessory Drive Style Mid Mount
Alternator Amperage 150
Alternator Included Yes
Application Gen III Hemi
Belt Included Yes
Brand Holley
Choose Your Part Accessory Drive Kits
Damper Included Yes
Damper Style Cast Damper
Emission Code 5
Engine Gen III Hemi - Non VVT
Finish Cast
Inlet Size 1.75
Material Cast Aluminum
Outlet Size 1.75
Output 150 Amps
Power Steering Hardline Included Yes
Power Steering Pulley Included Yes
Power Steering Pump Included Yes
Power Steering Reservoir Included Yes
Product Type Accessory Drive Kits
Pulley Style Serpentine
Tensioner Included Yes
Thermostat Included Yes
Warranty Limited 90 Day
Water Neck Included Yes
Water Pump Included Yes
Water Pump Pulley Included Yes
Part Number 20-290