LT1 Burb:pully pictures 66 factory air 327

[HOTFUN]

I finally got the snow off the hood and took some pictures of the ac pully set up.

Mark

[Captainfab]

That is strange looking. I have not seen a pulley arrangement like that before.

[LT1 Burb]

Thanks, I need to look at my pulleys and see if they are the same. I though there was 2-3 v grooves on the crank.

[HOTFUN]

I could look closer but these seem to be the same as the 67's which I have two of these engines. They use a single pully on the crank and then a cast iron bolt on 2 pully if I remember right.

[Captainfab]

The short water pump small blocks with A/C that I have seen, have a dual groove water pump pulley with the grooves right side by side. Then the same on the crank with another groove right next to the alternator belt groove.

[yelmer]

here is my 66 327 ac pulley

[62 Longbed]

The A/C set-up thats on my 66 pickup looks the same pulley wise other than not having power steering ...

[HOTFUN]

Well I know for a fact that the 65 and 66 factory air engine did not use a fan clutch and it is not listed in the GM parts book till either 67 or 68 trucks with factory air. My 66 does have the 5 blade fan which is part of the HD cooling which came standard with factory air. So I think the cast iron stud upper pully was used when they went to the fan clutch which the hub bolted on the studs of the cast iron pully. There is a great picture in the GM parts book of the fan pully arrangement of a factory air 65 or 66 in the parts blow up section in front of group nine I believe. I'm out of town so I'm not near my original 67 327 ac truck or the parts books at the moment. This 66 327 truck was built at Janesville and has a build date code of around June, 1966 and I have no doubts about this being the original parts on this engine. The truck has 67k miles on it and the spark plug wires are the original Packard date coded 1st qtr of 66 on them.

[yelmer]

the clutch fan was a option i do not know if it was a dealer option or plant ?the parts book list out the fan blade 3883159 for the blade the clutch was part number 3883158 the book list it as 65-66 (cac hd rad. 327 2nd design) the from 1968 parts book printed oct 1 1967

[HOTFUN]

I stand corrected on the fan clutch option. The 1970 print parts book also lists it as for 65-69 C10-30 (second design) 327 with factory air 7 1/8 diameter fan clutch. So what did the 283 use? I see no listing for that?
I don't remember what my 66 c10 283 factory air had on it back in the 80's when I owned it either. But I didn't think it was a fan clutch for some reason.
This 66 set up pictured above looks factory installed on my 66 C30 cab chassis which was a walkin camper body on it when I got it. It has a powerglide behind it and the rear axle was duals with 5:13 gears so maybe too many rpms for a fan clutch option?

[yelmer]

hello was that a dealer install ac ? the pulleys are for the 283 setup. which works great . the 327 used the cast pulley also the ac belt is smaller . it is hard to tell what the did on these trucks . in the 1965-66 accessories install manuals the picture in that looks like yours.

[HOTFUN]

It is a full blown Frigidaire date coded system and has all the right pieces like the below dash ash tray and all the correct holes and manifold attachments look factory. The glove box option sheet is gone but I got the Eldorado camper dealer sheet that listed the cab chassis options before the camper upgrade and it was a fully loaded C30 truck. 327 powerglide, ps pb factory air. tinted glass, full gages, radio. Notice it even has factory tinted glass. The alternator is date coded the same month as the engine and is a 42 amp which the 1966 dealer ordering book calls out as included with the factory air option. I'm thinking the low gear rear end may have something to do with no fan clutch here. I will dig into it more when I take it apart for restoration and maybe the air vent cut on the dash will shed some light on a later dealer cut dash. But also I should check if A/C or C60 is grease penciled on the firewall too. Just don't remember as I didn't doubt the factory air install.

[yelmer]

sounds good take some good pictures for the details thanks

[LT1 Burb]

I think these pulleys I have are like yours Yelmer, here is a picture of them and they are cast iron.

[yelmer]

on the 3 pulley there should be a cast part number in it that number would tell you the type it is

[LT1 Burb]

The crank pulley has a 299N on it and the water pump pulley has a 3868559 on it with an LB2 or L82.

[yelmer]

thats the right one mike

[LT1 Burb]

Anyone have a close up pic of how the accessories are strung on these.

[HOTFUN]

You can see your lower crankshaft set up is the same as my first pictures above and that uses the single steel next to balance then the two groove cast. The upper is like Yellmers picture and that 3 groove cast mounts on the studs of the waterpump and the built in casting is a spacer that the clutch fan mounts to. The belts all go on like my picture or Yellmers. Furthest back groove is the alternator to crank to water pump groove. second groove back or middle groove which is spaced one pulley width from the very back groove is the ac belt which goes around compressor to very front groove of water pump pulley and around the crank middle groove. Final is the power steering pump to the outer most crank groove only. On the 3 groove water pump cast pully the second groove is not used. Clear as mud right?

[yelmer]

Lt 1 burb . I hope this helps the belts numbers are ac belt 3851319 alt belt 3847702 ps belt 3848263 all gm numbers

[LT1 Burb]

OK, thanks for the pic. I figured out what needs to be done. I do however have a question. My pulleys don't line up and it looks like the water pump one needs to go back a 1/4" or get spaced forward a 1/4", any thoughts.

[dtkarst]

I have the same pulley from my 3/4 ton with power steering. My truck has A/C in it as well and it down to frame and motor right now. i can get some pictures if needed

[Slow Build]

These are some shots of the truck I took my AC out of. The crank pulleys are probably wrong because it's two pieces useing lug nuts as spacers between the two. The water pump pulley looks more correct for your application though.

[LT1 Burb]

Originally Posted by dtkarst

I have the same pulley from my 3/4 ton with power steering. My truck has A/C in it as well and it down to frame and motor right now. i can get some pictures if needed

Yes, any angle shots for pulley alignment, or if you can see any spacers behind the pulley, thanks.

[HOTFUN]

Either you have placed a spacer in front of the WP hub and behind the cast 3 groove water pump pulley or the new water pump hub was not pressed on the shaft far enough which I am betting it isn't. You could measure the the hub face surface distance to the pump casting and compare that to the original water pump hub distance or maybe someone here has a correct waterpump for measurement to compare. Then you will have to remove the wp rear cover and press the hub down the required distance with the the back of the shaft held in the press. The pulley just needs to go on further so the ac belt can ride in the outer water pump groove,to the second crank pulley groove, and over ac compressor.