I spent a few minutes in the '55-'58 parts book and see a wide variety of driving and driven pulley diameters depending on whether or not the car has p/s and/or a/c. Making sure all pulleys, spacers and brackets are appropriate to the equipment on the car would be a good idea. '55-'58 hemi impellers are different for each year, but have the same 10 bladed for a/c or no a/c within each year, so any flow rate difference must be done with pulley arrangements. There is a spacer shown for the fan itself in some years, the fan shroud is different for a/c cars (fully boxed) and the radiator core is different for a/c cars. Fans have more blades on a/c cars. Fan belts vary all over the map, depending on p/s &/or a/c. '55-'56 have three different vibration dampers. Rich Barber Brentwood, CA 1955 C-300-with p/s, no a/c, two pairs of fan belts From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Kenneth Krull Sent: Saturday, November 13, 2010 5:03 PM To: Chrysler300@xxxxxxxxxxxxxxx Cc: Kenneth Krull Subject: [Chrysler300] Water pumps Hello all, There has been a lot of talk about water pumps. Is the pulley on the water pump the same size on AC & non AC cars? Are the pulley size on the Harmonic balancer the same size? Did they use the same pulley on different engines like the 413 and 383? I've got questions but not answers. I know many of us have had problems with over heating, maybe sometimes it is because of the combination of pulleys and pumps. Ken Krull _____ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1153 / Virus Database: 424/3254 - Release Date: 11/13/10 [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylangYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/