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b20 idler pulleys 120-130

Hi,
I have a '68 122 with a motor that says "B20" of unknown origin. I'm trying to put AC in the car and am in need of an idler pulley. I've found one that is mounted on a post that comes straight out the back. It looks like this mounts in a hole on the drivers?!? side of a B20 in a photo on my site. I can't find a corresponding hole on my block and I can't figure out why the idler would be on the driver's side?

I've also found one that has an arm. This mounts on the passenger's side and again I can't find a corresponding hole on my head. I have a hole near there where my alternator attaches(GM alternator on homemade bracket) but I don't think it't the same spot as the mounted idler of that style on my site.

Last I posted a picture of my friend's '68 with a B18 and its stock idler. This is the style that mounts on top of the head through the head bolts. I can;t find one of these anywhere.

I've posted pics at:
http://homepage.mac.com/bearschmidt/122ac/
If anyone has any thoughts on how to mount the two styles I have or knows of one of the others for sale I'm interested.

Thanks!
Bear







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