How much cu.inches with 0.03 overbore?

Engine, Transmission & Driveline

  1. 330dTA

    330dTA Well-Known Member FCBO Gold Member

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    7FD18ED1-A038-4FC9-B7E9-A84C7BF5BBF9.jpeg 5AB4719A-CEF6-4796-B1F3-90A3CF8B7104.jpeg My ’69 440 is being rebuilt. Due to slight corrosion on top of the cylinders it was deemed necessary to bore it over. We ended up to 0.03”, and a set of KB Hypereutic flat top pistons, some decking, etc, basic rebuild stuff. - Now, as I’m extremely uncomfortable with those dimensions, I find it impossible to calculate the resulting volume. Can you help me: how much volume the 440 will have as a result? Closer to 450 or so?

    8173CBDF-D32E-4FA9-A9B3-749BBCB4D387.jpeg
     
  2. C Body Bob

    C Body Bob Old Man with a Hat

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  3. Ripinator

    Ripinator Senior Member

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    Volume of a cylinder = Pi x R Squared x H . . .
     
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  4. 68PK21 440.6bbl

    68PK21 440.6bbl Senior Member

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  5. moper

    moper Well-Known Member

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    it's 446 cid now. No need to worry about that. It's a normal service to refinish to that size.

    PS - are you sure those are hyper pistons? They don't look like what I remember. The top ring gap will be important to "get right" for the piston used.
     
  6. Chrome58

    Chrome58 Member

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    '69 440 V8
    4.32 (bore) x 3.75 (stroke)
    1 cylinder volume : (4.32 / 2)^2 x pi x 3.75 = 54,96 cid
    8 cylinders volume : 54,96 x 8 = 439,7 cid

    0.03 overbore
    4.35 (bore) x 3.75 (stroke)
    1 cylinder volume : (4.35 / 2)^2 x pi x 3.75 = 55,73 cid
    8 cylinders volume : 54,96 x 8 = 445,9 cid
     
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  7. 330dTA

    330dTA Well-Known Member FCBO Gold Member

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    Thanks for the replys! I know math, but am unfamiliar with the inches subdivided by something recalling metric system rather than being 1/16th, 1/32nd, etc part of an inch.
    I suppose 0.03 is 3/100 inches, but was not sure, and could not find anything on the web about it either. I suppose its obvious to some, and the rest could not care less. - Anyway, I found it curious to combine the metric and the other system anyway, which only added up to my confusion.

    Thanks guys!
     
  8. 68PK21 440.6bbl

    68PK21 440.6bbl Senior Member

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    Your welcome, now we can move onto a Hypereutectic -vs- Cast -vs- Forged Pistons thread!

    :lol:
     
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  9. moper

    moper Well-Known Member

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    Edit - No metric on these cars, and little fractional. It's (.000) thousandths or (.0000) ten-thousandths depending on what specs you're look at.

    piston ring thickness... those are still fractional...lol.
     
  10. 330dTA

    330dTA Well-Known Member FCBO Gold Member

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    Thanks, but no thanks, I'd rather not get into that discussion. Hypereutectic will suffice for my purposes. I'm not looking for a street&strip wonder. Instead, I'll be perfectly happy if my engine builder manages to find even close to all of the quoted 350 ponies... many of which were missing in the first place... LOL.
     
  11. Ripinator

    Ripinator Senior Member

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    The machinist who rebuilt my 440 also used hypereutectic pistons. They are a more than adequate replacement for stock cast pistons.

    What kind of cam are you running in the new motor?
     
    Last edited: Jul 11, 2018
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  12. 330dTA

    330dTA Well-Known Member FCBO Gold Member

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    Edelbrock Performer series cam, intake & carb combo. ’70 HP exhausts and TTI duals. Stock 906 heads with a valve job, new valves, brass liners and new HP springs. Period correct dual snorkel air cleaner and new 440source 6 quart pan.
     
  13. Ripinator

    Ripinator Senior Member

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    Mighty fine!