455 Crankshaft Rear Bushing

Discussion in 'Wrenchin' Secrets' started by IDOXLR8, Jul 31, 2022.

  1. IDOXLR8

    IDOXLR8 Senior Member

    I take it all 455 crankshaft were drilled for rhe bushing at the rear for a manual transmission? All? And what is the size of the outside diameter of the bushing?
     
  2. john.schaefer77

    john.schaefer77 Well-Known Member

    I remember reading somewhere on the board that they were not all cut for the bushing. I thought TA sold the bushing.
     
  3. Gallagher

    Gallagher Founders Club Member

    Not all 455 crankshafts are bored out to accept a bushing. Out of the dozen or so that I have, I would guess only four or five are. I could look if someone is really interested, but that sample size probably doesn’t represent the real percentage out of the millions produced.
     
    Max Damage likes this.
  4. DaWildcat

    DaWildcat Platinum Level Contributor

    Good discussion here:

    https://www.v8buick.com/index.php?threads/pilot-bushing-saga.322757/

    and

    https://www.v8buick.com/index.php?threads/wrong-or-right-pilot-bushing.116828/

    According to JW, if a BBB crank was not machined for a bushing, the crank IDs are all over the place. If that's the case, cut the crank OD larger to spec or machine the bushing OD smaller to work w/existing crank ID.

    Specific diameters are mentioned in the discussions, note recommended interference fit .0002" to .0005" mentioned by JW.

    Here's detail on a bushing from Summit Racing: https://www.summitracing.com/parts/ntl-pb656hd/make/buick/model/gs-455/year/1970#overview

    Brand:
    National Bearings and Seals
    Manufacturer's Part Number:
    NNTPB656HD
    Part Type:
    Pilot Bearings and Bushings
    Product Line:
    National Bearing Pilot Bearings
    Summit Racing Part Number:
    NTL-PB656HD
    UPC:
    724956022137
    Pilot Bushing Type:
    Solid
    Pilot Bushing Material:
    Brass
    Outer Diameter (in.):
    1.094 in.
    Inside Diameter (in.):
    0.594 in.
    Width (in.):
    0.750 in.

    Devon
     
    69GS430/TKX likes this.
  5. IDOXLR8

    IDOXLR8 Senior Member

    Guess I got really lucky, I have a Buick 455 lunati 10-10 crankshaft, never seen one since I bought this one years ago!
     
  6. IDOXLR8

    IDOXLR8 Senior Member

    Do you have a picture of one that was not set up for the bushing?
     
  7. IDOXLR8

    IDOXLR8 Senior Member

    Looks like I may be okay. 455crankshaft.jpg
     
  8. IDOXLR8

    IDOXLR8 Senior Member

    Is there a casing number or something telling the year,and all about the crankshaft.
     
  9. Jim Weise

    Jim Weise EFI/DIS 482

    nope, not really... the only reliably correctly size 400/430/455 cranks, in regard to the pilot bearing hole, are the original stick shift cranks. Every other crank is an unknown, until you break the tools out and measure it. Not uncommon for there to be two sizes in that hole, with a step between the two.

    JW
     
    69GS430/TKX likes this.
  10. IDOXLR8

    IDOXLR8 Senior Member

    Does the one in the picture look like it take the GM brass bushing?
     
  11. IDOXLR8

    IDOXLR8 Senior Member

    I'm I reading this right? Are the casting numbers showing if it a 400, 430, 455 Buick, or even if it's an Oldsmobile or a Pontiac crankshaft? I did not see any ID or casting numbers on line. I hope I have a Buick crankshaft.
     
  12. DaWildcat

    DaWildcat Platinum Level Contributor

    Al, no you're not reading it right.

    All the 4oo/430/455 crankshafts are the same as cast. So, a casting number won't tell you about whether or not a particular piece was used for a manual transmission or not.

    That's because a casting number is exactly that...cast into the crankshaft during it's processing at the foundry.

    After the casting though, machine work was done to make it into a usable piece.

    A part of that was what's called a "secondary" process to make the crankshaft usable for a manual transmission. It involved making that small spot at the rear acceptable for a bushing.

    What we're trying to tell you is that there's no way to know what you have, unless you have a crankshaft that came out of a production Big Block Buick manual trans car.

    If you don't know the true origin of the crankshaft, then it's time to start measuring what you have, to KNOW what you have.

    Devon
     
    Last edited: Aug 1, 2022
    69GS430/TKX likes this.
  13. DaWildcat

    DaWildcat Platinum Level Contributor

    And you said you have a "Lunati" crankshaft? I've never known them to supply a Buick 400/430/455 crank. But not saying they didn't.

    Time for more pictures, please.

    Devon
     
  14. IDOXLR8

    IDOXLR8 Senior Member

    Lunati was not involved with Buick that I know of, maybe re-boxed. I understand the part about the pilot hole. I just thought there was a way of knowing more about the crankshaft, more pictures coming.
     
  15. DaWildcat

    DaWildcat Platinum Level Contributor

    And sorry, still racking my brain and not remembering the casting number for 400/430/455 crankshafts, I'm thinking there isn't one. They're all the same.

    Devon
     
  16. IDOXLR8

    IDOXLR8 Senior Member

    I found it!! Pictures coming!
     
  17. IDOXLR8

    IDOXLR8 Senior Member

    1379242 crankshaft 1970-1976 455
     
  18. IDOXLR8

    IDOXLR8 Senior Member

    Pi8cture 1 crank1.jpg
     
  19. IDOXLR8

    IDOXLR8 Senior Member

    Picture2 crank2.jpg
     
  20. IDOXLR8

    IDOXLR8 Senior Member

    Picture3 crank3.jpg
     

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