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Holley Mid-Mount Complete Accessory Systems 20-242BK Drive Systems, Mid-Mount, Serpentine, A/C, P/S, LT1 Style Alternator/Water Pump, Belt, Hardware, Black, Chevrolet, Big Block, Kit

SKU: HLY20-242BK

Accessory Drive Systems

Holley Mid-Mount Complete Accessory Systems 20-242BK Drive Systems, Mid-Mount, Serpentine, A/C, P/S, LT1 Style Alternator/Water Pump, Belt, Hardware, Black, Chevrolet, Big Block, Kit

SKU: HLY20-242BK

Accessory Drive Systems
A$4,979.12
IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

Holley Mid-Mount complete accessory systems achieve what no other accessory bracket systems have: eliminate the brackets! This pulls in all the accessories tighter than other accessory drives by bolting directly to the water pump for a clean, integrated form. They offer superb engine visibility to show off your horsepower, not your accessories.

These systems have many swap-friendly features and share several design efficiencies with that of the C7 Corvette—plus they are truly complete. They come with everything you need: all accessories, all pulleys, the belt, heater hose adapters, and the alternator plug/harness, as well as color graphical instructions. Holley Mid-Mount complete accessory systems are available in several versions and finishes to match your GM application. Order the kit designed to fit your engine.

Features and benefits may include:

* LT1-style hairpin premium 150 amp alternator
* LT1-style water pump cartridge design
* Compact and reliable SD7 A/C compressor
* Type II power steering pump with baffled reservoir
* Power steering adapter hardline to AN -6 adapter
* OE pulley ratios for optimal accessory performance
* Bottom outlet heater hose options for swap application clearance

Part Type

BBC Accessory Drive Sys. Mid Mount - Black

Data: v4.2 - Upd: 2026-10-11 05:23:53

Specifications

Product Attributes - Brand
Holley
Product Attributes - Manufacturer's Part Number
20-242BK
Product Attributes - Part Type
Accessory Drive Systems
Product Attributes - Product Line
Holley Mid-Mount Complete Accessory Systems
Product Attributes - UPC
090127072813
Product Attributes - Pulley Style
Serpentine
Product Attributes - Crankshaft Pulley Included
Yes
Product Attributes - Crankshaft Pulley Material
Steel
Product Attributes - Crankshaft Pulley Color
Black
Product Attributes - Crankshaft Pulley Bolt Hole Quantity
Three
Product Attributes - Crankshaft Pulley Grooves
6-groove, serpentine
Product Attributes - Water Pump Material
Cast aluminum
Product Attributes - Water Pump Color
Black
Product Attributes - Water Pump Rotation
Counterclockwise
Product Attributes - Water Pump Pulley Included
Yes
Product Attributes - Water Pump Pulley Material
Steel
Product Attributes - Water Pump Pulley Color
Black
Product Attributes - Water Pump Pulley Grooves
Non-ribbed
Product Attributes - Power Steering Pump Style
GM Type 2
Product Attributes - Power Steering Pump Color
Natural
Product Attributes - Power Steering Pump Reservoir Included
Yes
Product Attributes - Power Steering Pump Reservoir Style
Attached
Product Attributes - Power Steering Pump Reservoir Material
Plastic
Product Attributes - Power Steering Pump Reservoir Color
Black
Product Attributes - Power Steering Pulley Included
Yes
Product Attributes - Power Steering Pulley Material
Steel
Product Attributes - Power Steering Pulley Color
Black
Product Attributes - Power Steering Pulley Attachment
Press fit
Product Attributes - Power Steering Pulley Grooves
6-groove, serpentine
Product Attributes - Power Steering Brackets Included
No
Product Attributes - Alternator Material
Cast aluminum
Product Attributes - Alternator Color
Black
Product Attributes - Alternator Amperage
150
Product Attributes - Alternator Style
1-wire
Product Attributes - Alternator Pulley Included
Yes
Product Attributes - Alternator Pulley Material
Steel
Product Attributes - Alternator Pulley Color
Black
Product Attributes - Alternator Pulley Grooves
6-groove, serpentine
Product Attributes - Alternator Fan Included
No
Product Attributes - Alternator Brackets Included
No
Product Attributes - Air Conditioning Compressor Type
SD7
Product Attributes - Air Conditioning Compressor Color
Black
Product Attributes - Air Conditioning Pulley Included
Yes
Product Attributes - Air Conditioning Pulley Material
Steel
Product Attributes - Air Conditioning Pulley Color
Black
Product Attributes - Air Conditioning Pulley Grooves
6-groove, serpentine
Product Attributes - Air Conditioning Bracket Included
No
Product Attributes - Idler Included
No
Product Attributes - Idler Brackets Included
No
Product Attributes - Tensioner Included
Yes
Product Attributes - Tensioner Style
Spring-loaded
Product Attributes - Tensioner Pulley Color
Black
Product Attributes - Tensioner Cover Included
Yes
Product Attributes - Tensioner Cover Material
Steel
Product Attributes - Tensioner Cover Color
Black
Product Attributes - Hardware Included
Yes
Product Attributes - Belt Included
Yes
Product Attributes - Coating Type
Powdercoated
Product Attributes - Finish
Gloss
Product Attributes - Quantity
Sold as a kit.

Reference Information

Brand Name/s Holley
StreetFX SKU hly20-242BK
SFX Item ID 4783272
Supplier Item Code 4783272
Manufacturer SKU 20-242BK
Manufacturer UPC 90127072813
Alternative References HOL20-242BK, LT1

Compatibility

Application Data
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1965
    Ending Year1970
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size6.5L/396
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1966
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size7.0L/427
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1970
    Ending Year1972
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size6.6L/402
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1970
    Ending Year1990
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size7.4L/454
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1991
    Ending Year1995
    Engine TypeV8
    Engine FamilyChevy big block Gen V
    Engine Size7.4L/454
  • UniversalNo
    MakeCHEVROLET
    Beginning Year1996
    Ending Year2000
    Engine TypeV8
    Engine FamilyChevy big block Gen VI
    Engine Size7.4L/454

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