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How tight should a timing chain be?

Discussion in 'Street/strip 400/430/455' started by 87GN_70GS, Mar 10, 2023.

  1. Mart

    Mart Gold level member

    Yep, Mike at TA says it's try one and send it back if too tight or loose and get next size.....buy a .002, .003, & .005 and that should do it.:)
     
    87GN_70GS likes this.
  2. Bens99gtp

    Bens99gtp Well-Known Member

    Lol. That about sums up life in general
     
    87GN_70GS and Mart like this.
  3. 87GN_70GS

    87GN_70GS Well-Known Member

    Prior to this test above, I stopped by the machine shop and asked. They said the line hone only takes about .002" off the caps which means the crank only moves .001"closer to the cam, if the hone process takes off equal amounts.
     
  4. 87GN_70GS

    87GN_70GS Well-Known Member

    I measured the crank gear, and the "valleys" measured 0.010" larger across the diameter than the std gear. So that would mean that it was designed to take up half that or .005" in being closer to the cam. So it is too big for my case
     
  5. Mart

    Mart Gold level member

    It's a crapshoot...
    I have a 9key .005 billet set in a non-honed block and it's perfect.
    Maybe Buick's tolerances were big. That same set fit slightly looser in an align honed block too.... Go figure....
     
  6. Mart

    Mart Gold level member

    Idk if I would swap gears around, as they're probably batched. Maybe ok, maybe slight variation.
    All the mating parts will get to know each other very quickly...:D:D
     
    87GN_70GS likes this.
  7. 87GN_70GS

    87GN_70GS Well-Known Member

    I measured both upper gears and the new one measured about .002" to .003" smaller in dia (across the teeth valleys) compared to the old one. So there is manufacturing tolerance
     
    Mart likes this.
  8. 87GN_70GS

    87GN_70GS Well-Known Member

    I asked tech that question and they said it would be ok
     
    Mart likes this.
  9. Mart

    Mart Gold level member

    If that's the case, an option would be larger crank gears made instead of buying a whole new set, as long as the chainset isn't worn out.
     

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