The belt only seems to last 2 weeks before it starts squeeling. Never had a problem before I built the 408. All the local parts stores stock are gates belts, 2 part #'s, I have tried 2 of each.

 

Make sure the crank pulley isn't loose. I ran into some belt squealing after I rebuilt my motor, it turns out the pulley worked it's way loose yet it wasn't visibly wobbly while running.

 

My Gates belt and Dayco belt both squealed...switched to a Gatorback and now no squeal.

 

Mine had a squeel because i had gunk built up on my idler pulley...cleaned it and it stopped the squeak

 

Crank pulley is tight. I replaced the tensioner pulley and idler pulley when I built the motor. I just ordered a gatorback belt today when I was at work so we will see if that fixes it.

 

Mine didn't squeal but made a sound like a gazillion crickets chirping...I just replaced it with a gatorback last weekend. No sound at all now.

 

It's recommended that belt replacement is done with the new tensioner. Not to mention belt type/brand make a difference. I did the same thing, new tensioner old belt. New idler pulley, still noisy. Then bought the 'better' belt and a few rides later it started making noise again..long story short, several belts (brands) later I buy the 'cheap o' and quiet as can be

 

If you just replaced the pulley, might wanna replace the tensioner arm as well...

 

thought it comes as a non serviceable assembly?

 

My Gates belt squealed like crazy. Put on a Dayco and it's quiet.