light weight crank pulley belts?

[Spike3099]

does anybody knwo what size belt the ac and alternator belts are after you go to a lightweight pulley? I don't want to make 5 trips to the autoparts store nor buy 5 belts . i am guessing 4 to 5 inches smaller than stock am i right? thanks for any info

 

[doug]

Just for a crank pulley (not the whole UR underdrive set), I went 1/4" shorter and it's just right. I tried 1/2" shorter but I couldn't get them on, at least on the alternator one I tried.

 

[Spike3099]

thanks alot

 

[IPT]

Here are the two belt numbers for Under drive pulleys:

040365
040384