Buick 455 crankshaft cap

Discussion in 'Street/strip 400/430/455' started by erik duarte, Jan 20, 2021.

  1. erik duarte

    erik duarte Member

    So this might be a stupid question, but will a Oldsmobile crankshaft cap fit on a Buick? I was replacing the rear main seal and the cap cracked.
  2. 1973gs

    1973gs Well-Known Member

    NO! Find a new cap and then have your engine line bored.
  3. erik duarte

    erik duarte Member

    I’ve looked online but I can only find some on eBay. Where would I be able to buy some new?
  4. hugger

    hugger Well-Known Member

    You're screwed

    New isn't available and even it was the engine now will need to be take apart and line bored and honed,...IE time for fresh bottom end
  5. Fox's Den

    Fox's Den 27 years of racing the same 355 Buick motor

  6. Bens99gtp

    Bens99gtp Well-Known Member

    Which cap did you lose, program here in ohio used to make the center 3 in billet steel. I think they have a different name now and not sure if they do carry/make for our motors any more.

    But there is no way around having the tunnel bored and honed......even if you find a stk cap. I think I have a few stk caps floating in a tub
  7. erik duarte

    erik duarte Member

    It was the rear, the one closest to the flywheel.
  8. ranger

    ranger Well-Known Member

    I think I may have a good spare. Let me know if you want me to look.


    Aiken, SC
  9. buick64203

    buick64203 Just plum crazy Staff Member

    How do you crack a rear main cap?
    Mark Demko likes this.
  10. Bens99gtp

    Bens99gtp Well-Known Member

    I dont have a rear cap
  11. Thumper (aka greatscat)

    Thumper (aka greatscat) Well-Known Member

    pretty sure I have some,I'll check tomorrow
  12. erik duarte

    erik duarte Member

    If you have a rear cap that your willing to send my way message me.
  13. erik duarte

    erik duarte Member

    I’m honestly not sure myself, I put the rope seal in after I replaced all the bearings and started to torque the caps back on and it cracked.
  14. Mark Demko

    Mark Demko Well-Known Member

    Post a pic
  15. Thumper (aka greatscat)

    Thumper (aka greatscat) Well-Known Member

    I have a cap, whats your Zip?

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