Extra clearance 440 Main Bearings

Discussion in 'Mopar Performance Issues' started by simon1mopar, Jan 21, 2018.

  1. simon1mopar

    simon1mopar Member

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    Can anyone advise a manufacturer and part number for a standard 440 crank .001" extra clearance main bearing. I can't find one , my current clearance is only.0015" and I want .0025"
     
  2. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

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    • famous bob

      famous bob mopar misfit

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      you can get them from Summit racing, I did.
       
    • Demonic

      Demonic Well-Known Member

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      You're going for a race clearance? You know, .0025 is the max, the spec is .0005" - .0015" from the FSM.
       
    • bOb shingler

      bOb shingler Well-Known Member

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      hemi bearings.
       
    • brian6pac

      brian6pac Well-Known Member

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      Don't go less than .0025. Clevite has them for sure.
       
    • brian6pac

      brian6pac Well-Known Member

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      Looks like NLA from king or clevite, polish the crank down .001"
       
    • BigBlockMopar

      BigBlockMopar BigBlockMember

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      I don't see why you would want 20 years of wear already on the bearings. Just so one can(needs to) run 20W50 oil?
       
    • brian6pac

      brian6pac Well-Known Member

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      Go ahead and run .001 clearance and 0W20 oil and when you spin a main and waste the block I'll still be running mine 7000 rpm with straight 40W
       
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      • simon1mopar

        simon1mopar Member

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      • simon1mopar

        simon1mopar Member

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        agreed, street and race are totally different requirements, I'm running 7200rpm and 14-1 compression, like you say you'll definitely spin a bearing with standard clearance. These old girls aren't manufactured to the tolerance of the new gen engines that will live with tighter clearances
         
      • simon1mopar

        simon1mopar Member

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        Yeah thanks Brian, just musn't be much call for them and they've stopped manufacturing. My old crank was 10under and polished so not a problem but it's now a two piece crank and not working so well!
         
      • simon1mopar

        simon1mopar Member

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        Yeah thanks, going for a race spec
         
      • famous bob

        famous bob mopar misfit

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        street hemi`s came out of the factory w/ .003 straight across the board, that tell u anything ? I have about .0025 on my 505, and would rather had a hair more. I don`t think we even have decent crank man around here anymore, so what are u to do except added clearance bearings ?
         
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