454 Stock bore..
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454 Stock bore..

  1. #1
    I'm No Expert Shaun's Avatar
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    Default 454 Stock bore..

    Buddy of mine found a guy selling a complete 454 needing a rebuild. He paid 700 for it and it came with a decient set of cobra OT jetboat headers... The headers look simular to the non-twist bassets, actually they have the same sleek back look that the twistys have but with out the twist. Anyway, the block is 2 bolt main which i wasnt too thrilled about but i know others have talked about making huge hp numbers on two bolt mains and he's just going to build somthing mild, my guess 300 to 400 hp range. One advantage was the heads are 049's! I'm thinking he got a pretty good deal now. This is where i'm confused though... i measured the bore and i'm getting 4.247 which is weird because shouldnt the stock bore be 4.250? Are my tools or retarded (cant be me )?

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    Some guy obnoxious001's Avatar
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    Is the bore clean, or is there .003" of carbon built up on the top where you are measuring. My guess is you are using calipers?

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    I'm No Expert Shaun's Avatar
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    using a dial bore guage and measuring about 1" down into the bore. They are pretty black though it could be .003 of build up i suppose.

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    Some guy obnoxious001's Avatar
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    What did you set the dial bore gauge against? One inch down it should be worn at least a bit.

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    I'm No Expert Shaun's Avatar
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    2" extension + 2.2 + .050 spacer so the guage was set at 2.250, pre-loaded the guage, zeroed it, and subtracted what i got from the 2.250... thats how i came up with 4.247, the guage measures in .0005 increments.

    I also used a caliper just to compare and got 4.246, course this is at the edge of the cyl.

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    Some guy obnoxious001's Avatar
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    If you have a 4-5" micrometer, you can calibrate the dial bore gauge against it.

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    It's what we do BDMarine's Avatar
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    It is a stock bore. I don't think it matters at this point what measurement you get as he is going to rebuild it. I would assume he is going to get new pistons, probably .030 over, so the important thing is measuring the new pistons and specifying the new bore diameter.
    New pistons gives him the ability to truley have the correct piston to wall clearance and a long service life with the heart of the engine. He has no history of what abuse this engine has seen before he bought it.... such as overheating, over reving, etc. If he is going to spend the money to rebuild it, don't cut corners by using the old pistons.
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    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by BDMarine View Post
    It is a stock bore. I don't think it matters at this point what measurement you get as he is going to rebuild it. I would assume he is going to get new pistons, probably .030 over, so the important thing is measuring the new pistons and specifying the new bore diameter.
    New pistons gives him the ability to truley have the correct piston to wall clearance and a long service life with the heart of the engine. He has no history of what abuse this engine has seen before he bought it.... such as overheating, over reving, etc. If he is going to spend the money to rebuild it, don't cut corners by using the old pistons.
    no, He's going to get new pistons and it's going to be bored over, but if my measurement of the bore is wrong and he buys .030 over pistons and the bore is really already .060 over that's going to suck. It's going to go to a machinest so he could tell me for sure obviously but i want to make sure this block hasnt reached it's max bore... pointless to drag a block to the machinest for nothing.

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    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    If you have a 4-5" micrometer, you can calibrate the dial bore gauge against it.
    I dont have a micrometer that big, i'm kinda thinking what i'm getting is correct though considering i meausred with both the dial bore guage and my caliper and the difference was only .001 (caliper measured the top of the bore..)

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    Razor Wire Militia 髯岙喢殮作's Avatar
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    could it be a 396 block that has been bored??? did you check to see if in fact it is a 454 by running the casting #'s?

  13. #11
    I'm No Expert Shaun's Avatar
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    cast number is 14015445, when i looked it up it said 454

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    Razor Wire Militia 髯岙喢殮作's Avatar
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    Quote Originally Posted by Shaun View Post
    cast number is 14015445, when i looked it up it said 454


    good deal just checking .. thats what i get when I look it up as well

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    I'm No Expert Shaun's Avatar
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    obnoxious001 brought up a good point to me via pm. These dialbore guages have changable peices and what i've put in is a 2" extension, plus a 2.2" pin, with a .050 shim... I'm assuming of course that now i'm at 4.250 but it's possible that maybe im really not. Guess i need a larger mic

  16. #14
    It's what we do BDMarine's Avatar
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    4.250 is a standard bore for a 454. It has not been bored.
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