I've ordered my 8 rib pulleys (12 rib won't fit my application) & need to figure out the proper belt to run on this application. I have a 8" +/- crank pulley and a 2.75" P600B blower pulley, BUT I also have a "custom" spring loaded tensioner, so I can run a shorter belt. The old belt was a K080415 (3.25" blower pulley), the 12 rib belt I got with the 2.75" pulley I bought was a K120400, so I am thinking a K080400 should do the trick. I did a short test with the K080415 & it got up to about 6 PSI in 2nd gear and then slipped pretty bad (it was about shot anyway though). Anyone w/ experience with this setup?

I know NAPA is apparently the best place to buy these, but after searching & reading some old threads here, I tried to cross over the part # 25-080415 on the NAPA website & it was invalid.

 

Try contacting http://www.beltsforanything.com/site1.php

they had belt sizes that I was not able to find through NAPA

 

Thanks, I will need to contact them as their search function does not work & they have no "K" belt listings online. I'll post back here when I find out something.