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Thread: 427 BBC crank making contact with piston

  1. #1
    Senior Member MASTER BUILDER
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    Oct 2003
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    427 BBC crank making contact with piston

    I am doing rebuild on a friends engine and after removing the oil pan I noticed the #6 piston on the bottom , looks like it was making contact with the crank. It is only on one piston and I thought it was very odd.
    The contact is minimal but worrying.
    I checked the rod bearing thinking maybe if it was worn out the extra play would make it hit the crank , but it was still in good condition. I also took a good look at the rod pin bearing and it looked fine also.
    Anybody ever experiance anything like this before ???
    Any help appreciated.
    Thanks
    Al

  2. #2
    Senior Member RACING JUNKIE BEAST477's Avatar
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    Is it possible this engine has been rebuilt before and the marks could be from a bearing issue earlier? Did they make mention of any noises to you before you tore it down?
    BEAST477






    Only a rich man can afford to use cheap parts.

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  3. #3
    Senior Member SENIOR BUILDER chevynovaman's Avatar
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    TIP

    I HAVE SEEN THEM DO THAT WITH A BENT ROD.... GOOD LUCK
    1968 CAMARO 302 4 SPD IN THE ROUGH
    1957 CHEVY FUEL INJECTED LS1 4L60E BEAUTY
    1962 CHEVY II NOVA 496 LETS RACE

  4. #4
    Senior Member RACING JUNKIE
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    Re: 427 BBC crank making contact with piston

    Quote Originally Posted by altune
    I also took a good look at the rod pin bearing and it looked fine also.
    Al
    Pin bearing, whats that?

    Quote Originally Posted by chevynovaman
    I HAVE SEEN THEM DO THAT WITH A BENT ROD.... GOOD LUCK
    X2 on what he said....

    Pull the rod/piston and have it checked out.
    ***IN GOD WE TRUST***

  5. #5
    Senior Member RACING JUNKIE
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    Re: 427 BBC crank making contact with piston

    [quote="cepx111"]
    Quote Originally Posted by altune
    Quote Originally Posted by chevynovaman
    I HAVE SEEN THEM DO THAT WITH A BENT ROD.... GOOD LUCK
    X2 on what he said....

    Pull the rod/piston and have it checked out.
    x3 Bent rod - does not take much.
    Dave
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke

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