A/C Pulleys on a 72 Small Block?

[Virginia72SWB4X4]

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,

[JimKshortstep4x4]

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

[Virginia72SWB4X4]

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

[pickupman]

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

[Virginia72SWB4X4]

Bill,

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

Gary

[pickupman]

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

[JimKshortstep4x4]

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

[Virginia72SWB4X4]

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

Gary