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Thread: Too much of a good thing ???
          
   
   

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  1. #1
    18436572's Avatar
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    Too much of a good thing ???

     



    I am putting in new parts on an old 454 block. Fresh valve job already done with new springs. The cam is a hydraulic roller with 276 and 510 lift. I checked the mains with new bearings with plasti gage. Numbers 1, 2, 3, and 4 show 0.003" and number 5 shows 0.004" This is slightly out of spec. The crank is already ground 0.030" I have not checked the rods yet. Is this too much gap on the crank? Will a HV oil pump make up the difference?
    Thanks for your response.

  2. #2
    jerry clayton's Avatar
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    Plasti gage is a last resort for checking clearances

    we put the mains in and inside bore gage them for size and compare that to the crank size----well actually we zero the bore gage on the crank size and then read the clearance directly on the torqued mains

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    pat mccarthy's Avatar
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    yep that happens alot . seams some bearing makers add more size to the flange bearing thats the back thrust #5 did you mic the crank ? plasti gage i do not trust and do not use . did you check your housing bores of the block? evey thing has a hi and low spec get a under size or low crank and a big housing main bore adds up to a loose crank. i will not tell you if its going to work for you .but i do feel that a thrust can take abit more size you could try another make of bearing that my help tell me who s they are ?
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip

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    I am not sure what you mean by checking the housing bores of the block.
    They bearings are made by King
    Do you know which maker may make bearings on the thicker side?
    The crank is ground 0.030 already, will going to 0.040 make the crank too weak?
    My plans are for new pistons going from flat top to .210 dome for 9.6 DCR

  5. #5
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    I measured the crank with a caliper. The mains run between 2.715 and 2.718.
    I think I know what you mean by housing bore of the block. The crank is in the block now so I will remove the crank, put the caps back on and torque them, then check the inside diameter of the mains without the bearings.

  6. #6
    pat mccarthy's Avatar
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    kings run under size it seams on main for the bbc and if a H .the main thurst will be 001 under all others 1thru4. its not hard to be at 004 + on them been there many times .try a set of feds or clevitte 77s we have ground crank for real size with bearings in the block so we can move up or down on oil clearance .you need to check this with some thing better then a caliper like a dial bore gauge and a mic your going to have a hard time getting any thing less then a bore gauge to get real numbers i use all sunnen stuff to read sizes your dealing with stuff that needs to be check under .0005 .for that job i have bore gauges that read in .0001 graduations any other way your pissing in the wind
    Last edited by pat mccarthy; 11-02-2010 at 12:16 PM.
    Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip

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