Explain over boring an engine

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5.0 and 5.7 Discussion, Explain over boring an engine in Cadillac Engine Discussion; I keep here this, its over bored, whats its mean???...
  1. #1
    carguy16's Avatar
    carguy16 is offline Cadillac Owners Enthusiast
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    Jul 2004

    Explain over boring an engine

    I keep here this, its over bored, whats its mean???

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  3. #2
    davesdeville's Avatar
    davesdeville is offline Banned
    Automobile(s): 1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
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    Aug 2003
    Albuquerque, NM

    Re: Explain over boring an engine

    The cylinder is bored out to a larger size. Many times they bore it .030" larger than it was, (if you hear "It's bored 30 over" that's what it means). Of course there are many other bore increases. When you bore an engine out, it's usually because it has a lot of miles on it and the cyl. wall isn't even anymore. If you bore an engine out, you'll need a new set of pistons in that bore size. Occasionally you might see a big bore engine that the person bored it out for more displacement, but that's not nearly as common.

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