Harold and group, With our 20+ year old V belt technology, A good V belt that will ride moderately high in the grove is and 11A type ( 11mm wide at top) for the alternator and WP and 13A ( 13mm wide) for the AC compressor. US manufactures are trying to cheapen the belts and making them thinner and they are sitting further down in the grove. Stay away from them. You want a belt that will be a little above the pulley 1/16th" or so and it should be 11MM across the top for WP and Alt and 13mm for AC belt. The Gates and Dayco are normally running about 10.66mm wide . I have also found that Dayco is selling a 10A belt to replace the 11A type and it won't work. They ride to far into the grove and they will heat up and stretch and break real fast. I have found a foreign made belt that is 4 Nylon plies with the new inside teeth technology that will help it run cooler that is 11mm + wide. Looks like a good belt and I have several people running them now. John Hervey www.specialtauto.com P.S. I sent all the 10A Dayco back, but the Gates are or seem to be holding up good. -----Original Message----- From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of Harold McElraft Sent: Monday, October 03, 2005 6:27 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] Re: Alternator Belt Good question. The manual (M:04:01) says 6-10 mm with moderate thumb pressure from the top. So what is moderate and how do you measure the deflection? I use to do it with a long straight edge I had and I used a flat edge to deflect the belt. Harold McElraft - 3354 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/