Pulley numbers needed

[Pete Pritchett]

I am adding power steering to my 1965 327cu 350 hp roadster. And need the pulley numbers for the deep or wide groove puleys for the water pump and the crank shaft/harmonic balancer pulley, or pulleys.
I found a parts catalog that listed part #3858533 as the two groove pulley on the harmonic balancer. But, I need a part number for the one grove pulley that attaches to the two groove pulley and a part number for the water pump pulley.
I have a pulley number #3766987 and think it is a pulley for a later year car. Can it be used instead of the #3858533 pulley? And how well would it match up with the other pulley?
The pulley numbers are not listed in my assembly manual or the Judging manual.
Is there a book that lists the part numbers on particular year model cars? Or is there another source or method to find part numbers?
Thanks as usual.

[Joe L.]

Re: Pulley numbers needed

Pete-----

I'm not certain of the 1965 L-79 with N-40 pulley configuration; I have conflicting information. However, I'm pretty sure that the GM #3858533 is the correct crankshaft pulley. Early examples of this pulley were stamped "3766987" so if you have a pulley with that number on it, you have what I believe to be the correct pulley.

As far as a forward, add-on pulley, I'm not certain if one was used, or not. If the car uses an idler pulley, then there was an add-on pulley used. If it doesn't use an idler pulley, there may or may not have been an add-on pulley used. In any event, if an add-on pulley was used, then the chances are great that it's GM #3751232, which is still available from GM.

With the add-on pulley, the p/s pump pulley is usually a stamped steel pulley of GM #3770509. Without the add-on pulley, the p/s pump pulley is usually a cast iron pulley of GM #3834720.

[Eugene B.]

Re: Pulley numbers needed

Pete,
Here is pulley information from my '65 250 HP with PS.

Water pump pulley: 3790356 2 groove 7 inch diameter
Balancer pulley: 3744043 2 groove 6 3/4 inch diameter
Power steering: 3751232 1 groove 6 3/4 inch diameter

Don't know whether these numbers apply to 350 HP or not.

Best regards,
Gene

[Scott Marzahl]

Re: Pulley numbers needed

I can tell you what I have discovered for a '67 L-79. The AIM is not totally correct and the double C/S pulley is #3558533, the P/S pulley is cast and is #3834720 and the double water pump pulley is #3770245. This does not use an idler pulley or the additional "232" add on C/S pulley for the power steering per the AIM.

[Pete Pritchett]

Re: Pulley numbers needed

Thanks to everyone on their responses. It will help a bunch.
Joe do you show pulley #3770245 as the correct water pump pulley for a 65 L79 with power steering?

[Joe L.]

Re: Pulley numbers needed

Pete-----

Yes. I'm pretty confident that the GM #3770245 is the correct water pump pulley for the 65 L-79 w/N-40 application. In fact, it's the only pulley used for 1965 SHP applications, regardless of N-40. I may have forgotten to mention it in my previous post.