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#42520220
Holley 20-220 GM LT4 Engine Wet Sump Mid-Mount Accessory System
$3,058.95
/kit
Factory Shipped
$3,399.95
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Product Summary
Universal Fit, Water Pump Included, Alternator Included
Rebates Available
See rebate detailsKey Specs
| Pulley Style | Serpentine |
| Crankshaft Pulley Included | No |
| Water Pump Included | Yes |
| Water Pump Material | Cast Aluminum |
| Water Pump Finish | Natural |
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Holley 20-220 Details
HOLLEY PREMIUM MID-MOUNT COMPLETE ACCESSORY SYSTEM FOR GM GEN V LT4 WET SUMP ENGINES
Complete GM Gen V LT4 Accessory Drive System w/ Alt, P/S, A/C, Water Pump, Belts, and hardware.
Holley's complete accessory systems for LT4 and LT5 applications have all accessories pulled up and in tight. Plus, they add the much needed hydraulic power steering solution. There are no shortcuts here. Holley incorporates a splined dual bearing system that eliminates all belt stresses on the P/S pump's internal bearings, assuring long life. The supercharger drive maintains the original and optimized belt path and tensioner. The accessory layout is as if the original manufacturer had designed it for your swap application. Included with each drive system is a throttle body angle correcting adapter that better positions the TB for swap applications as opposed to the aggressive original application intended angles. Versions of these accessory drives are available for both wet and dry sump applications.
Features:
Charts
Instruction Sheet (PDF)
Rebates
Holley Heritage Sale 10% off Select Parts
Holley Heritage 10% Off Select Parts Sale, running from July 6, 2026, through July 31, 2026. For a limited time, customers can save 10% off on select parts, making it the perfect opportunity to upgrade your vehicle with high-quality components. Sale prices apply to purchases made during the sale period only. No rainchecks or exceptions will be provided. This sale cannot be combined with any other offers, discounts, or promotions.
Guides & Documents
Holley 20-220 Specifications
Holley 20-220 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 20-220 |
| Brand | Holley |
| Pulley Style | Serpentine |
| Crankshaft Pulley Included | No |
| Water Pump Included | Yes |
| Water Pump Material | Cast Aluminum |
| Water Pump Finish | Natural |
| Water Pump Pulley Included | Yes |
| Water Pump Pulley Material | Steel |
| Water Pump Pulley Grooves | Non-ribbed |
| Power Steering Pump Included | Yes |
| Power Steering Pump Bracket Finish | Natural |
| Power Steering Pump Brackets Included | Yes |
| Power Steering Pump Bracket Material | Aluminum |
| Power Steering Pump Finish | Natural |
| Power Steering Pump Reservoir Included | No |
| Power Steering Pump Style | Type 2 |
| Power Steering Pulley Attachment | Press Fit |
| Power Steering Pulley Finish | Black Painted |
| Power Steering Pulley Grooves | 6-groove, serpentine |
| Power Steering Pulley Included | Yes |
| Power Steering Pulley Material | Steel |
| Alternator Included | Yes |
| Alternator Material | Cast Aluminum |
| Alternator Finish | Natural |
| Alternator Amperage | 150 amp |
| One Wire Alternator | Yes |
| Alternator Pulley Finish | Black Painted |
| Alternator Pulley Grooves | 6-groove, Serpentine |
| Alternator Pulley Included | Yes |
| Alternator Pulley Material | Steel |
| Alternator Bracket Finish | Black painted |
| Alternator Bracket Material | Cast Aluminum |
| Alternator Brackets Included | Yes |
| A/C Compressor Finish | Natural |
| A/C Compressor Included | Yes |
| A/C Compressor Type | Sanden SD-7 |
| A/C Pulley Finish | Black Painted |
| A/C Pulley Grooves | 6-groove, Serpentine |
| A/C Pulley Included | Yes |
| A/C Pulley Material | Steel |
| A/C Bracket Finish | Natural |
| A/C Bracket Included | Yes |
| A/C Bracket Material | Cast Aluminum |
| Idler Brackets Included | Yes |
| Idler Included | Yes |
| Tensioner Included | Yes |
| Tensioner Style | Hydraulic |
| Tensioner Cover Included | No |
| Hardware Included | Yes |
| GENERAL | |
| Sold in Quantity | Kit |
| GTIN Code | 090127056479 |
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Fitment
Fitment
2015-2018 Chevy Corvette
6.2 Chevy LT V8


