Katech Performance Belt Tensioner | LS1 engines (KAT-A4425)

Katech Performance
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Billet Belt Tensioner by Katech Performance

Katech Inc. has been involved with the C5-R race program since 1997. One of the first things that was noticed was there seemed to be a bad spot in the rpm range where the serpentine accessory belt would want to jump off of the pulley. This is the origin of our solid adjustable belt tensioner. After installing this tensioner on the race engine, the belt problem disappeared. Even though this problem was found on the race engines, it is also the same case with the standard LSx engines.

These belt tensioners are a must for anyone doing any sort of performance driving with a Gen 3 / 4 powered car or truck. Without it, the belt can be thrown by the stock tensioner. This is not something you want to happen when you are going down the strip or racing around the road course.

Not recommend for use on supercharged engines unless the supercharger has a dedicated drive.


  • Prevent belt jump
  • Billet Aluminum construction


  • Gen 3/4 LSx Corvette, CTS-V, Camaro, Firebird, GTO, G8 & SS

What's In The Box?

  • Anodized Tensioner with Laser Etched Logo
  • Pulley


  • Manufacturer Standard Warranty

Customer Reviews

Based on 4 reviews
Ron Harden
Works awesome

Very well made and color is great. Easy to install and set the belt tension.

Nicholas Deaver

Fit my car perfectly and took away my belt issues

james simone
Just what I needed

It looks great and is well built fit perfectly with no problems and what I liked a lot it has a torque spec for the belt tension so u don't over do it witch will help to not destroy ur accessories no other that I have used came with that thanks a lot very very happy with the product

Katech Billet Belt Tensioner

This high quality part easily met expectations. Finish was like jewelery! Shipping was
prompt. I am very satisfied with this purchase.