Best V-belt?

[72 LS5]

I believe I have Goodyears on right now, but they have that toothed inside. I'm getting a squeal at high rpms and I really don't want to tighten it any further. Everything seems to be turning freely and I have an oversized alt pulley. I'm blaming the belts......

[Sam (Bones)]

I had a problem with top cog belts too with my alt located in the stock location, found a standard V belt and seem to cure it, I was throwing belts

 

I changed to a mid-mounted alt bracket which solved all my issues

[Mike 57]

I always had good luck with Gates Belts. I would still toss one every once in a while. I changed to serpentine belts and had better luck. I did not toss any belts his year and the the motor has been to 7k.

[MC-71]

Dito on Gates.

[wallaby]

Alignment of the belts is important, too. The front belt is the easiest to check, you can use a straightedge placed across the lower pulley and see if the water pump and alt pulleys are located too far back, or at an angle to that lower pulley. I had to shim my water pump pulley outward .060 ..perhaps the pump flange was pressed on too far. I also found that the top of the alternator was leaning rearward and had to move the upper bracket a bit to get it straight.

 

Once I got the pulleys all pointing straight to one another, my belt issues went away.

[USMCBLB125]

I never had any luck with V-belts. My 383 stroker would toss everyone one of them once i hit 10k.