ZZP Ecotec Serpentine Belts

Pulleys & Belts - ZZP Ecotec Serpentine Belts
Pulleys & Belts - ZZP Ecotec Serpentine Belts

ZZP Ecotec Serpentine Belts

20 reviews
Belt Size
Regular price $39.99
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"Stage 2 LSJ" is for smaller pulley (3.1" and lower) M62 cars.

"Stock LSJ" is the stock OE length belt for the Cobalt SS and Ion Redline. 

"400" is the stock replacement belt for LNF, LE5, L61, LSJ (turbo) with Air Conditioning.

"390" is for your LSJ turbo converted car or LNF, LE5, L61 car with an ATI underdrive pulley.

"345" is the stock replacement belt for LNF, LE5, L61, LSJ (turbo) without Air Conditioning. Or if you were to remove your AC compressor.

"705" is the most common belt for our 2.2/2.4 supercharger kit.

For 20 years ZZPerformance has engineered products to give you an advantage in your race builds. Setting records has meant finding small advantages where we can. ZZP was the first to run 10's in a 3800, we hold the M90 supercharger record. We own one of the industries only supercharger dynos. In the LSJ market where you are limited to 6 ribs, ZZP holds the M62 dyno record. An OEM or aftermarket brand serpentine belt is meant to last as long as possible which leads to only being cost effective, but often times decreased performance. These attributes do not match the priorities we have and to meet our needs we designed our own line of belts.

Working with a major OE manufacture of belts, we experimented with various compounds until we achieved success. A belt with less slip under maximum load giving us a competitive advantage over builds using GM or Dayco or any off the shelf brand of belt. Just another in the long line of custom engineered products now available to you. If you're not running a ZZP belt, you're leaving a little HP on the table.

Stage 2 Belt notes

This belt was designed for use with GM's original stage kits which come with a 3.1" pulley. Running pulleys smaller than this works because of the Cobalt's tensioner but there are things to keep in mind:

1. A smaller pulley means the belt isn't as tight because it will have more slack.

2. A smaller pulley has less surface for the belt to grip

3. Smaller pulleys produce more boost, which in turn requires more HP to turn the blower. This additional HP increases the chance of belt slippage.

Ideally, this belt is used with a 3.1" pulley. A 3.0 is quite fine. As you go smaller problems can arise and it's recommended to use our adjustable tensioner instead of the smaller belt. Another option is using our oversized tensioner pulley with the smaller belt. We have seen belt failures with nearly all 2.7 and 2.6" pulley users who only run a smaller belt. We have seen many failures with 2.8" pulley users as well.

Customer Reviews
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Kyle B.
United States

Better than OEM

This is a quality belt. In combination with the ZZP adjustable tensioner, no more belt slip on my LSJ cobalt after swapping to a 2.9 inch pulley.

Jacob S.
United States United States

I put it on fine and within 24hrs it’s missing one of the ribs I’m not saying it’s a bad belt by any means just maybe got a dud I don’t know I just know I now have to order another one because this one didn’t hold up at all and I literally only drove my car to work and home casual driving and all

Brad E.
United States United States


Haven’t got to use the item. I really could use a pulley puller but I just don’t have spare cash right now to do it with. I broke my foot 6 weeks ago and have been out of work.

Nelson R.
United States United States


I haven’t put it on yet waiting for my adjustable tensioner form you guys (ZZP) then I’ll put it on right away.

Jason B.
United States United States

Awesome! Fit perfectly and there is no slip or squeal at all. When comparing to oem you can definitely tell it's heavier and stronger and made of better material.

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