crank pulley differences and years?

[mylittlecj5]

CJ and I were kinda talking about this today...
I have a 3 bolt, 2 groove crank pulley on my 360 in my CJ5 . Obviously the engine has been swapped in, and I don't know what year it is.
I am having trouble finding a 3 groove, 3 bolt pulley to replace it so I can install a York A/C compressor for On Board Air.
I just bought a '88 GW 360 that has a 4 bolt crank pulley, set up for A/C. I have an extra set of York brackets (no pulleys) that match it exactly, but they do not fit my CJ-5s 360.
SO my question(s) is this:
what years of AMC 360s use a 3 bolt or a 4 bolt crank pulley? Can they be swapped out by replacing the harmonic balancer? Are the early 360s different than the later ones?

The 4 bolt here is one I mistakenly bought a couple years ago. It didn't fit. The one on the right is off my CJ-5s 360.


This shows the difference in height between the 2, and the different sheaves in the pulleys.


Also, does anyone have a pic of how the A/C is mounted and the belts run on an early (3 bolt) A/C engine?

 

[LongHorn]

Sounds like you need a 4 bolt harmonic balancer & a puller.

 

[LongHorn]

I know they cost more, but are more plentiful.

 

[LongHorn]

You might also want to try Bulltear's forum, their all about AMC engines.

 

[mylittlecj5]

I've been to bultears many times...they just don't carry the pulley I want.
Is the harmonic balancers interchangeable between years? what is the crank end difference? what about internal balance? thats what I can't find.

 

[LongHorn]

This is the one I bought.Professional Products Online

 

[LongHorn]

I think the three bolt crank pulley is 71' or earlier.

 

[mylittlecj5]

This is the one I bought.Professional Products Online

that right there might be the ticket to getting the right parts for my OBA! A big thank you for that Longhorn!
Now I will just have to dig around and see if I still have that old 4 bolt pulley...

 

[LongHorn]

That's the way it goes. First your money then your clothes.