JCCamaro

After very short time, with a short attention span my searches yield me with nothing, so hopefully I can get a quick answer here:

I need to know what size the belt is on a 408, apparently the stock ls1 belt is just a tad smaller. The belt keeps wanting to ride itself off. I tried to look it up but I'm impatient and I'm working suspension before it gets too dark. I can always pick up the belt first thing tomorrow morning.

custm2500

iTrader: (11)

The belt walking off has nothing to do with size. You have an alignment issue. One of your pullies are not in line.

JCCamaro

i looked it up alittle bit and apparently its a common issue, about 6k+ rpms the belt with walk itself off because the tensioner is too weak

custm2500

iTrader: (11)

I see. Sounds like a tensioner is what you need then. Something I had never heard of.
Or are you saying with a shorter belt it allows the tensioner to apply more pressure?

JCCamaro

its a stock size belt. i thought at first it needed a bigger belt, but then it turned out my tensioner is just worn out. so i just ordered a katech tensioner, hopefully that will put an end to my problem.

PAGregSS

iTrader: (10)

Stock length belt is 79". I put a 10% Fluidampr underdrive pulley on my 408 and went with a 78" belt and have no problems.

01'SSLSX

all u have to do is take a piece of string, rap it around the acessories like normal and measure the length of string