1965 Dodge Dart 273 with A.C. Pulley Questions

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I think the '65 V8s had two belts and '66 V8s had a single belt- could have been a mid-year '65 change at some point.
I think the '66 version with one belt & TWO pulleys (a tensioner & an idler) offers better or more belt "wrap" around the AC compressor pulley and also the alternator which would explain the revision.
For pics see here:
1965 vs 1966 273 AC accessory drive
 
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I know I'm reviving an old post. I have a 4 sheave crank with a factory A/C car witha double sheave RV2 compressor. I see alot of differing opinions and I'm trying to decipher facts. 66 had 2 idlers. I cannot find a true 65 diagram and varying pictures of diagrams. Apparently 65 is a year where they experimented different designs. Does anyone have solid photos of 65 year design in functioning order with a double pulley compressor and whether or not they used idlers as well as relative photos to routing of the belts?
As I look at my pulleys, the power steering gets it's own, of course. But the alternator has a double sheave, and one is used with the fan/water pump pulley. How in the world do I route the outer sheaves to the a/c? And is one shared with the second sheave of the alternator? Or should I have a single alternator pulley with a tensioner for the 2 for the a/c?

So many questions, too many different designs, and not enough factory literature to provide a concrete answer.
 
I think this is a ‘65 Factory 273 V8 routing with power steering.

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SSVDP said:
I think this is a ‘65 Factory 273 V8 routing with power steering.

View attachment 1715374700
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This is a later model, the Saginaw pump is a later design. 65 comes with a federal or trw pump and has the power steering on the 3rd sheave from the front, the a/c is driven by the front two. The fan and alt is driven by the 4th, closest to the timing cover.

This makes me think the 65 should only use a single tensioner with the two belts standalone from the other components, 66 they changed it all up.
 
sgrip65 said:
Jay. I do not know what to tell you. Indeed, the 65 slant 6 Dodge I have was a single pulley, but as I look at Ulf's pics, I see his is a double pulley. 65 Dartman suggested that the double pulley, possibly, was factory; whereas, the single pulley may have been dealer installed. Your 66 has factory air with a single pulley, so between Plymouth and Dodge may have been a change in what they put in them. Was Dodge a cheaper version than the Plymouth or vice/versa? Interesting. Examining these old cars and what they did to construct them brings up some questions to be answered I guess. I appreciate your help. Jerry
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I had a 65 Belvedere with air and it had dual belts and felt it was dealer install,I have a 66 Dodge dart 273 with factory air and it has single pulley,Thought I would share
 
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