I am looking for a non-A/C crankshaft pulley for my 70 GSX without air conditioning. This pulley is smaller in diameter than the A/C version and only has 2 grooves. I am not concerned with numbers, just one that works. Anyone have one? Thanks in advance. Brian
Are you sure? I would be concerned about the #'s because that is the ONLY way you will get the correct pulley. All pulleys will bolt up, even 350's, but they all had specific diameters and/or offsets. I went thru this with my 71 stage without a/c, as it turned out I needed a 3 groove crank, and one groove is not used, from the factory. I don't know if it is true for 70's, but many times I have seen references to stage 1 or GSX. If you have a 70 assembly manual, you will find the page that lists the pulleys (by number) with drawings. Then I'd post the correct number, otherwise you will not know what you are getting from someone. If all else fails, ask Duane.:grin: :TU:
Dan, was it you and I that sorted that out a while back we took measurements. and I sold you a 71 3 groove pulley. Sorry can remmember but did that for someone.:beer
Yeppers That was them. I had sold mine a year earlier because I thought they were wrong! After looking for about a year for the wrong ones , later I found out about my blunder.ou: The good news, just about everything got the 3 grooves that year.:grin:
I think I have one Brian. I can send you a PM later. i have the whole set I'd like to get rid of though. I can check condition and the part number. Bob
Thanks for all of the responses. I have to admit that I didn't consider all of the issues related to the pulleys (numbers-matching). I couldn't find the part number and I have just about everything ever published for Buicks including the GM assembly manuals. I got the upper pulley a while back (thanks to Buick Doctor). Brian
Brian, heard my name mentioned, Here are the part numbers for 70 455 crank pulleys, 1375143 for all stage 1 AC/non-AC, and 455 non-stage with AC, and ALL GSX (3 grooves) 1375142 for all 455 non-stage 1 without AC (2 grooves) (Taken from page 6-5.2 in the 70 assembly manual.) NOTE; the book also states that all GSX's got the 3-groove pulley, regardless of the engine type/AC/non-AC, as of 12/2/69. So the 3-groove is the one you need. If you don't get one with the correct number, the offset will be wrong and it won't work. Duane
Duane, Good information! I didn't realize all GSX's used the same pulley whether or not they had A/C. I know the diameters are different so it must be related to how fast they wanted to turn the accessories. Brian
uzzled: the third groove is to run 2 alternator belts :Smarty: you will also need a 2 groove altenrnator pulley :3gears: :bglasses: :TU:
Brian, This also means that you need the AC style pulley for the fan, that gets mounted on the water pump. That part number would be 1375146. If you got a non-AC pulley from "Buick Doctor" that won't work either. Duane PS. None of them ran 2 alternator belts, the single belt ran on the outer groove.
yes they did :eek2: :Smarty: my 69 Stage 1 non a/c 4spd has 2 groove alt. 3 groove crank pulleys my 72 skylark has a non a/c 70 stage 1 motor and has 2 groove alt. 3 groove crank pulleys
o No: uzzled: then why the extra groove uzzled: o No: check out Carls # matching non A/C stage 1 http://www.cprychlik.freeservers.com/photo.html o No: uzzled: o No: uzzled: o No: uzzled: o No: looks like 2 belts too me what a sweet ride :TU: :bglasses:
Mark, The Stage 1's came with 55 amp alternators with 2 groove pulleys whether they had AC or not. If you had a Stage 1, or a GSX, it came with the AC pulleys as standard, this is exactly the info I posted above for Brian. If you had AC they used the back groove for clearance for the AC compressor belt. The belt goes right through the void where a rear Alt belt would be. For non-AC cars they used the front groove, like they did with the AC cars and also left the rear groove empty. You would have to ask GM why they didn't have a single groove pulley for this application, I don't know but it was probably so they didn't have to "stock" more parts. I am sure they didn't care about the price difference between a 1 or 2 groove pulley. I will post Page 6-5.2 from the 70 Assembly manual so you can see the drawing developed by Buick Engineering for the assembly line workers. Duane
Boy! I always thought A/C Buicks had 3 grooves and non-A/C had 2 grooves. I guess life isn't that simple. It sounds like everything is as clear as mud when GM gets in the picture. I have the 3-groove setup but I assumed it was incorrect. Brian
o No: well ........may they didn't come from the factory that way but over the years I've scene many (cars and pix) non A/C stage 1's running 2 belts :bglasses: :TU: PS. you would have to find an original owner and see what they had to say
the # on the alt. pulley off my 69 stg 1 is 1961406 uzzled: and it is larger than the alt.pulley on my 72 Riv :Smarty: :bglasses: :TU: