A/C Pulleys on a 72 Small Block?
 

I'm adding A/C. Is the crank pulley a three groove style with the outer groove larger in diameter?
Is the water pump pulley a two groove and both are the same diameter?
I've got access to a couple of donor vehicles, not all 67-72 but the pulleys look similar to me.

Opions and pics welcome!

Cheers,
:bowtie:

Both sets of pullys are the same diameter. I can get numbers off of the pullys if you need them.

Be careful mixing pullys as you can end up with misaligned belts.

Jim

Jim,

Thanks I am concerned about that. I don't have all the compressor mounting brackets yet so I'm doing this kinda blind right now.
If it's not to much trouble numbers would help

Gary

Gary, the water pump pulley is the same diameter with 2 groves. The crank pulley is actually 2 pulleys, one sets inside the other and both are same diameter. inner pulley is single grove and outer is 2 groove.
Bill

Bill,

Thanks! I may be coming up to see you. Do have compressor brackets and maybe pulleys?

Gary

Gary, I have brackets, maybe pullies, I'll have to check.
Bill

Here are the part numbers for the crank pullys and the water pump pulley.

Water pump pulley is a double, PN 1235778

Crank pulley, inner double, PN 3744043 BA

Crank pulley, outer single, nests into inner, PN 3751232

Here is a pic, sorry about the quality, I have trouble with black parts as they don't show up well.

Jim

Thanks Jim that helps alot. I see now the donor vehicles aren't the same.

Gary