I just ordered that actually! Doesnt' matter when it gets here as long as it's next week. I have to run her on the old crank pulley and water pump as I'm getting exhaust done Friday-Sat. Can't believe NPD and ACP make an interference fit for a 5-3/4" which everyone and their mother repros and yet don't sell the one I just bone-yard paid through the nose for.
I don’t remember the measuremeant. I believe it was pulley C6AE-8509-A which is 5 7/8”. The non A/C pulley is 6 7/16” which is about 1/2” wider.Did you end up with the 5-3/4" or with the 5-5/16"?
Ok, I went over and checked my car. The Crank pulley is C8OE-6312-B, the Water pump pulley is C6AE-8509-A which is 5 7/8” as I thought. The original Non A/C water pump pulley was wider at 6 7/16”. It wouldn’t work and I had to swap it for the smaller A/C pulley.Well! That's interesting that you are able to run a 5 7/8 WP diameter while I can't do a 5-3/4". The crank pulley I bought from NPD lists as a 6-5/8 inner pulley size for a 289 A/C car. I have a 302. The middle hump part between the two inner sheaves is interfering with the 5-3/4 WP pulley by just a fraction of an inch. The junk CP from CAA just cleared it by a fraction of an inch so it's less thick in the middle by a tiny amount.
So I'm still at a loss as to why the most common WP pulley size doesn't fit?? I have a 302 instead of a 289 but there should not be any difference of the CP and WP mounting locations. I have a very standard aftermarket aluminum water pump that is brand new as of last year. Perhaps a casting copy error brought it down a very small amount.
If I really wanted to waste some time I could rig up this CP and the 5-3/4 with a junk water pump on my original 289 to see if it all fits. But ehhh. Hoping the next part will resolve this. It should. Pretty big drop for 3/4" to 5/16". I think even a 5.5 would work if such a thing existed. But there is only one company that does this in the aftermarket at 5.0" and 5.25" under drive and their prices are even more obscene than the common repros and used parts markets.
NPD part I bought for crank that resolve my clattering noise is this:
Buy part #6312-5A PULLEY CRANKSHAFT STEEL BLACK TRIPLE sheave repro C5AZ-6312-D for your classic vehicle from National Parts Depot. Free shipping on orders over $300, fast delivery & everyday low pricing! Order now!www.npdlink.com
The fact that you had to shim the WP pulley out to line up makes me wonder if your harmonic balancer is fully on the crank. You mig need to tighten it some to see if it will go on further.I think I found an interim solution! WP pulley needs to come forward about 1/8” or so. I put two big heavy washers around the pump tip, tightened the fan/clutch assembly on and the sheaves clear one another. Ran it with one belt for 5 minutes no issues. Belts line up just fine.
Only problem is though is the the pulley has a little bit of runout no matter how evenly you tighten the 4 bolts. Not much but a little bit more than I’d like to see. Didn't affect anything when revved to high RPM but this is a temp fix.
I’m going to try it with my other pump pulley tomorrow which is the same size (that ACP one) might work better and get me cruising through the weekend.
Now that I know they exist I’m looking for a real pump pulley spacer.
Thanks for looking. The only reason in can think that I cannot make clearances work with a 5-3/4” without shimming the pump pulley forward 1/4” is that either the aftermarket pump isn’t proportioned like the OE.....or ACP’s crank pulley is thicker on the sheaves than the OE. I noticed my OE crankOk, I went over and checked my car. The Crank pulley is C8OE-6312-B, the Water pump pulley is C6AE-8509-A which is 5 7/8” as I thought. The original Non A/C water pump pulley was wider at 6 7/16”. It wouldn’t work and I had to swap it for the smaller A/C pulley.
Truuuust me it’s down on there! I know what I’m doing. If it wasn’t flush it would bang and wobble everywhere.The fact that you had to shim the WP pulley out to line up makes me wonder if your harmonic balancer is fully on the crank. You mig need to tighten it some to see if it will go on further.