This complete high-mount accessory drive kit includes the R4 A/C compressor, alternator, power steering pump, belt, and pulleys — everything needed for LS and LT engine swap applications, sourced from OE suppliers, in black finish.
Specifications:
- Brand: Holley
- Category: Belts and Cooling
- Application: GM LS and GM Gen V LT, L83, L84, L86, L88
- Engine: GM Gen III/IV (LS) and GM Gen V L83/L84/L86/L87
- Accessory Drive Style: High-Mount
- Finish: Black
- Material: Cast Aluminum
- A/C Compressor: R4
- Alternator Amperage: 130
- Output: 130 Amps
- Pulley Style: Serpentine
- Includes: belt, R4 compressor, 130-amp alternator, power steering pump/pulley, and idler/tensioner pulleys
- Sub Category: Accessory Drive Belt System Components
- Warranty: Manufacturer's Limited 90 Day Warranty
- Part Number: 20-136BK
Requires a separate installation kit (21-1, 21-2, or 21-3) for assembly. LT-series installations require additional parts: 21-5 LT installation kit, 22-100 LS water pump with forward-facing outlet, and 717-15 throttle body angle adapter.
FAQ
What engines does this kit fit?
GM LS engines and GM Gen V LT engines (L83, L84, L86, L88).
What's the alternator output?
130 amps.
Is additional hardware needed for LT engines?
Yes — the 21-5 LT installation kit, 22-100 LS water pump with forward-facing outlet, and 717-15 throttle body angle adapter.
Does the kit include the drive belt?
Yes, a 6-rib serpentine belt is included.

