Holley 20-242BK Holley Big Block Chevy Mid-Mount Complete Accessory System
Holley 20-242BK Holley Big Block Chevy Mid-Mount Complete Accessory System
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Holley 20-242BK Holley Big Block Chevy Mid-Mount Complete Accessory System

4 stars out of 1 review
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Key item features

  • Integrated Design: Features a bracketless accessory mounting system where components bolt directly to the water pump for a clean, integrated form and enhanced engine visibility.
  • Advanced Water Pump: Incorporates an LT1 style water pump design with optional side or top heater ports, and recessed top thermostat bypass and heater ports.
  • Premium Alternator: Equipped with an LT1 style premium alternator utilizing 6-phase technology, similar to the C7 Corvette.
  • Compact AC: Includes a compact SD7 A/C compressor with a line adapter, and a Type II power steering pump with a baffled reservoir.
  • Complete Kit: Comes as a complete system with all necessary accessories, pulleys, belt, A/C line adapter, heater hose adapters, and power steering to -6 AN hardline.
  • Optimal Performance: Designed with OE pulley ratios to ensure optimal performance of all accessories.
  • Aesthetic Options: Available in both natural and black finishes, featuring billet alternator, tensioner, and compressor pulley covers.
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Current price is $2,202.95
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Comparison Chart:
Vehicle model20-242BKHolley 20-242BK Holley Big Block Chevy Mid-Mount Complete Accessory System20-370Holley 20-370 Holley Small Block Ford Mid-Mount Complete Accessory System20-370BKHolley 20-370BK Holley Small Block Ford Mid-Mount Complete Accessory System89094Dayco 89094 Fits select: 2013-2018 RAM 2500, 2003-2012 DODGE RAM 2500LSHolley Performance 20-186 Accessory Drive Component Mount Set97-249Holley 97-249 Idler Pulley-Smooth LT4 GM EngineLSHolley Performance 20-135 Accessory Drive Component Mount Set20-320BKHolley 20-320BK High-Mount Accessory Drive - With Holley Oiling System - Base Kit - BlackCX2553VALVE - EXHAUST GAS (P)LT5Holley 97-269 Idler Pulley-Smooth SC LT5 GM Engine
Vehicle makeChevyHolley 20-242BK Holley Big Block Chevy Mid-Mount Complete Accessory SystemFordHolley 20-370 Holley Small Block Ford Mid-Mount Complete Accessory System-Holley 20-370BK Holley Small Block Ford Mid-Mount Complete Accessory SystemSterlingDayco 89094 Fits select: 2013-2018 RAM 2500, 2003-2012 DODGE RAM 2500GMHolley Performance 20-186 Accessory Drive Component Mount SetGMHolley 97-249 Idler Pulley-Smooth LT4 GM EngineHolleyHolley Performance 20-135 Accessory Drive Component Mount SetFordHolley 20-320BK High-Mount Accessory Drive - With Holley Oiling System - Base Kit - BlackFordVALVE - EXHAUST GAS (P)GMHolley 97-269 Idler Pulley-Smooth SC LT5 GM Engine
Vehicle fitment typeSpecificHolley 20-242BK Holley Big Block Chevy Mid-Mount Complete Accessory SystemUniversalHolley 20-370 Holley Small Block Ford Mid-Mount Complete Accessory SystemUniversalHolley 20-370BK Holley Small Block Ford Mid-Mount Complete Accessory SystemSpecificDayco 89094 Fits select: 2013-2018 RAM 2500, 2003-2012 DODGE RAM 2500SpecificHolley Performance 20-186 Accessory Drive Component Mount SetSpecificHolley 97-249 Idler Pulley-Smooth LT4 GM EngineSpecificHolley Performance 20-135 Accessory Drive Component Mount SetSpecificHolley 20-320BK High-Mount Accessory Drive - With Holley Oiling System - Base Kit - BlackSpecificVALVE - EXHAUST GAS (P)SpecificHolley 97-269 Idler Pulley-Smooth SC LT5 GM Engine
Automotive parts divisionPerformanceHolley 20-242BK Holley Big Block Chevy Mid-Mount Complete Accessory SystemPerformanceHolley 20-370 Holley Small Block Ford Mid-Mount Complete Accessory SystemPerformanceHolley 20-370BK Holley Small Block Ford Mid-Mount Complete Accessory System-Dayco 89094 Fits select: 2013-2018 RAM 2500, 2003-2012 DODGE RAM 2500PerformanceHolley Performance 20-186 Accessory Drive Component Mount SetPerformanceHolley 97-249 Idler Pulley-Smooth LT4 GM EnginePerformanceHolley Performance 20-135 Accessory Drive Component Mount Set-Holley 20-320BK High-Mount Accessory Drive - With Holley Oiling System - Base Kit - Black-VALVE - EXHAUST GAS (P)PerformanceHolley 97-269 Idler Pulley-Smooth SC LT5 GM Engine
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4 out of 5 stars
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Showing 1-1 of 1 review

Jun 23, 2022
Todd454
4 out of 5 stars review

Great system with some flaws

After installing the kit I learned a few things. There is no way to see the timing pointer or balancer to set timing for the engine. I removed the power steering pump and still could not see to set timing. A view is available from behind the water pump, but it is not any help due to the angle. Also had to remove the passenger side valve cover to install the second bolt for the A/C compressor. So make sure your timing is set before installing. Otherwise the product works great.

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