Bore size for 454?
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Bore size for 454?

  1. #1
    Senior Member XClutchboy725's Avatar
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    Default Bore size for 454?

    Is 4.253 - 4.254 good for a standard bore on a 454?

    I just tore mine down and I'm trying to decide what to do...

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    gn7
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    what you really want to know is the bore taper top to bottom and roundness, 4.253 you can live with, but not if it isn't consistent top to bottom



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    All eight holes taper about that 1 thousandth. Is that no bueno? Bore .30 over or just hone to 4.254?

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    gn7
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    it's going to depend on your pistons and how much clearence they need. If you were to buy a set of pistons mmade of 2618, they need more clearence then say TRW and you may need to hone it enuff to staighten them out. But if you are buying new pistons, then just bore it



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    Senior Member XClutchboy725's Avatar
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    Pistons are GM Part# 3963550 They have so little wear I can still see the groves on the skirts!

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    It's what we do BDMarine's Avatar
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    Unhappy

    The only way to know what size bore you need is to measure your pistons.
    Last edited by BDMarine; 05-30-2008 at 05:03 PM.
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    gn7
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    buy the time you hone it straight it well be atleast 4.2545 to 4.255, take it to a machine shop and they can tell you what your final clearence will be. The pistons never wear if everything is right



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    Senior Member XClutchboy725's Avatar
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    What should the variance/difference be?

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    It's what we do BDMarine's Avatar
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    Why does my post have an unhappy face at the top?
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    Senior Member XClutchboy725's Avatar
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    maybe you were unhappy when you wrote it?

    Pistons seem to be 4.2440 at the skirt. Does that sound about right?

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    Make that 4.2445

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    gn7
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    if you measured that 90* to the pin ---even with the pin it's a tad loose for that piston. But here is the main point. The bottom of your bores are the original bore size, there is very little wear there. If you hone it till the bore is straight, you will be approx. 2 maybe 3 thou looser than new. You decide



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    Thanks for the replies. I appreciate all the knowledge here on these boards.

    It sounds like you think things would be a tad loose. That's good information to have.

    Part of me wants to put this one back together, and part of me wants to order a 540 short block!

    ...just weighing all the options.

    Thanks again!

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    Quote Originally Posted by XClutchboy725 View Post
    Thanks for the replies. I appreciate all the knowledge here on these boards.

    It sounds like you think things would be a tad loose. That's good information to have.

    Part of me wants to put this one back together, and part of me wants to order a 540 short block!

    ...just weighing all the options.

    Thanks again!
    Hey clutch. without knowing the piston diameter and cast or forged. off the top I would hone and buy .005 over rings and file to fit and be real careful on the beak-in! Your'e numbers are close enough to work and depending on the pocket book and what you want go with it. IMO M

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