70 455 non-A/C Crank pulley

Discussion in 'Parts wanted' started by brians, Jul 30, 2004.

  1. brians

    brians Well-Known Member

    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
     
  2. TXGS

    TXGS Paint by numbers 70 GS 455 4spd

    Brian I may have one I pulled from a 400. I will get back with you on it this evening.
     
  3. Dan Healey

    Dan Healey Well-Known Member

    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:
     
  4. TXGS

    TXGS Paint by numbers 70 GS 455 4spd

    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
     
  5. Dan Healey

    Dan Healey Well-Known Member

    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.:Dou:

    The good news, just about everything got the 3 grooves that year.:grin:
     
  6. buickgsman

    buickgsman Well-Known Member

    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
     
  7. brians

    brians Well-Known Member

    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
     
  8. TXGS

    TXGS Paint by numbers 70 GS 455 4spd

    Here is the lower Brian.
     

    Attached Files:

  9. TXGS

    TXGS Paint by numbers 70 GS 455 4spd

    Another Pic
     

    Attached Files:

  10. Duane

    Duane Member

    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
     
  11. brians

    brians Well-Known Member

    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
     
  12. MGSCP

    MGSCP Guest

    :puzzled: the third groove is to run 2 alternator belts :Smarty:

    you will also need a 2 groove altenrnator pulley

    :3gears: :bglasses: :TU:
     
  13. Duane

    Duane Member

    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.
     
  14. MGSCP

    MGSCP Guest

    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
     
  15. Duane

    Duane Member

    Not according to the 69-72 assembly manuals.
    Duane
     
  16. MGSCP

    MGSCP Guest

    :Do No: :puzzled: then why the extra groove :puzzled: :Do No:

    check out Carls # matching non A/C stage 1

    http://www.cprychlik.freeservers.com/photo.html


    :Do No: :puzzled: :Do No: :puzzled: :Do No: :puzzled: :Do No:

    looks like 2 belts too me

    what a sweet ride :TU: :bglasses:
     
  17. Duane

    Duane Member

    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
     
  18. brians

    brians Well-Known Member

    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
     
  19. MGSCP

    MGSCP Guest

    :Do 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
     
  20. MGSCP

    MGSCP Guest

    the # on the alt. pulley off my 69 stg 1 is 1961406 :puzzled:
    and it is larger than the alt.pulley on my 72 Riv :Smarty: :bglasses: :TU:
     

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