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Holley Mid-Mount Complete Accessory Systems 20-240 Drive Systems, Mid-Mount, Serpentine, A/C, P/S, LT1 Style Alternator/Water Pump, Belt, Hardware, Natural, Chevrolet, Small Block Gen I, Kit

SKU: HLY20-240

Accessory Drive Systems

Holley Mid-Mount Complete Accessory Systems 20-240 Drive Systems, Mid-Mount, Serpentine, A/C, P/S, LT1 Style Alternator/Water Pump, Belt, Hardware, Natural, Chevrolet, Small Block Gen I, Kit

SKU: HLY20-240

Accessory Drive Systems
A$4,972.18
IN STOCK! Est Ship 3-7 Days days. In stock at 1 location (6 available)

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Description


Data: v2 - Desc: v4.2 - Upd: 2026-11-08 02:14:56

Data: v4.2 - Upd: 2026-11-09 15:34:52

Features

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Holley, Hilborn, Holley Efi, Retrobright, Terminator X
StreetFX SKU hly20-240
SFX Item ID 4782255
Accounting SKU hly-20-240
Manufacturer SKU 20-240
Manufacturer UPC 090127072233
Alternative References 20-240, HLY-20-240, HOL20-240

Accessory Drive Systems, Mid-Mount, Serpentine, A/C, P/S, LT1 Style Alternator/Water Pump, Belt, Hardware, Natural, Chevrolet, Small Block Gen I, Kit

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

Product Attributes
BrandHolley
Manufacturer's Part Number20-240
Part TypeAccessory Drive Systems
Product LineHolley Mid-Mount Complete Accessory Systems
UPC090127072233
Pulley StyleSerpentine
Crankshaft Pulley IncludedYes
Crankshaft Pulley MaterialSteel
Crankshaft Pulley ColorBlack
Crankshaft Pulley Bolt Hole QuantityThree
Crankshaft Pulley Grooves6-groove, serpentine
Water Pump MaterialCast aluminum
Water Pump ColorNatural
Water Pump RotationCounterclockwise
Water Pump Pulley IncludedYes
Water Pump Pulley MaterialSteel
Water Pump Pulley ColorBlack
Water Pump Pulley GroovesNon-ribbed
Power Steering Pump StyleGM Type 2
Power Steering Pump ColorNatural
Power Steering Pump Reservoir IncludedYes
Power Steering Pump Reservoir StyleAttached
Power Steering Pump Reservoir MaterialPlastic
Power Steering Pump Reservoir ColorBlack
Power Steering Pulley IncludedYes
Power Steering Pulley MaterialSteel
Power Steering Pulley ColorBlack
Power Steering Pulley AttachmentPress fit
Power Steering Pulley Grooves6-groove, serpentine
Power Steering Brackets IncludedNo
Alternator MaterialCast aluminum
Alternator ColorNatural
Alternator Amperage150
Alternator Style1-wire
Alternator Pulley IncludedYes
Alternator Pulley MaterialSteel
Alternator Pulley ColorBlack
Alternator Pulley Grooves6-groove, serpentine
Alternator Fan IncludedNo
Alternator Brackets IncludedNo
Air Conditioning Compressor TypeSD7
Air Conditioning Compressor ColorNatural
Air Conditioning Pulley IncludedYes
Air Conditioning Pulley MaterialSteel
Air Conditioning Pulley ColorNatural
Air Conditioning Pulley Grooves6-groove, serpentine
Air Conditioning Bracket IncludedNo
Idler IncludedNo
Idler Brackets IncludedNo
Tensioner IncludedYes
Tensioner StyleSpring-loaded
Tensioner Pulley ColorBlack
Tensioner Cover IncludedYes
Tensioner Cover MaterialSteel
Tensioner Cover ColorBlack
Hardware IncludedYes
Belt IncludedYes
Coating TypePowdercoated
FinishGloss
QuantitySold as a kit.

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