Instant Rebates
Call Our Support Line
24 Hours / 7 Days a Week!  
Same Day Shipping Before 11 PM ET
My Cart
Shop By Vehicle
Shop By
Close Menu
Shop By Vehicle
Top Categories
All Categories

All Categories

Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates

Holley 21-3

Long Belt Installation Kit

Holley 21-3


jegs shipping
FREE Shipping
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
Holley 21-3 Long Belt Installation Kit $105.95
Long Belt Installation Kit

Holley 21-3 Details

Installation Kits

Belt alignment commonly used on trucks and 2010-up Camaro.


Mounting Hardware Included
Accessory Drive Kit Component Type
Installation kit
Sold as a kit
Manufacturer's Part Number:

Holley LS Series Accessory Drive Kits are simple, clean, cost-effective solutions to the accessory drive challenges encountered when swapping a GM LS engine into a muscle car, truck, hot rod, or other vehicle. Holley Kits supply the required brackets and hardware needed for installation yet allow you to choose the source for supplemental accessories and components that are often already on the engine or vehicle. These kits were designed to deliver correct belt alignment, factory stability, and stock-style appearance. Whether sourcing from the salvage yard, local auto parts store, GM parts dealer, or Holley, you pick the accessories that match your needs and budget!

Click for Fitment Guide #510-20-131
Click for Fitment Guide #510-20-133
Click for Fitment Guide #510-20-135

Note: An application specific installation kit is required for most applications (#510-21-1, #510-21-2, or #510-21-3)

21-3 - Holley LS Accessory Drive Kits is rated 5.0 out of 5 by 2.
Rated 5 out of 5 by from installed on a 1977 el camino installed on a 1977 el camino with a 6.0l ls conversion. a simple bolt on installation with no modifications. belt size was 1123 and alignment was perfect. was very impressed with the quality. a little higher in price than competition but well worth the difference.
Date published: 2016-11-03
Rated 5 out of 5 by from Proper Fit The Holley 21-3 spacer kit fit properly to the Holley 20-130 accessary drive kit for my LS3 powered 56 Corvette restomod pro touring project.
Date published: 2016-03-01
  • y_2017, m_7, d_25, h_9
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_2
  • loc_en_US, sid_10001_10001_2114040, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_jegs
Items You Need