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bore/stroke ?

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    Senior Member eliminator's Avatar
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    Default bore/stroke ?

    working with a unknown ford 460 . the bore just under 4 1/2 and the stroke is 3 15/16 . no numbers anywhere . what would this be?
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    It's what we do BDMarine's Avatar
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    How much under 4.500?

    4.500 x 3.937 = 500.92
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    was told it was a 513 cubic inch ?
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    Quote Originally Posted by eliminator View Post
    was told it was a 513 cubic inch ?
    A 513 should have a 4.44" bore and a 4.140" stroke.

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    www.highflowdynamics.com LakesOnly's Avatar
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    Quote Originally Posted by eliminator View Post
    working with a unknown ford 460 . the bore just under 4 1/2 and the stroke is 3 15/16 . no numbers anywhere . what would this be?
    The numbers you have provided as "bore" and "stroke" for this engine are much too vague for anyone to pinpoint actual displacement.

    But that doesn't particularly matter, as a few fractions one way or the other is not likely critical in your case or in the case of the engine's performance; you've given us a basic idea....

    Your engine displaces about 500 inches, give or take. Although none of us could possibly have a clue as to exactly what your combo may be, I will venture to guess--based on the approximate bore and stroke numbers, and what is says about the period in which your engine was likely created--that you have a 4.47 bore x 3.95 stroke, offset 460 crank with a Chrysler rod journal. This is a common BBF piston size (4.47") and the stroke 3.95") is common when offset stroking a BBF 460 crank to Mopar RJ size. This makes 496 cubes, by the way, and can be made to really scream....but the combo I am musing over is still speculation in the case of your engine.

    You could probably get more accurate bore and stroke dimensions with a caliper than you can a ruler, doooooood.

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    yes , I know a better measurement would help, but us poor people have to do what we can . this is not my engine nor do I fool with fords so I dont know what to look for or at . just trying to get a guesstamate on what it might be . thanks for the input .
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    www.highflowdynamics.com LakesOnly's Avatar
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    Post pics that clearly show the short block's topside (piston tops) and the rotating assy (rods and crankshaft). That, and even something as simple as a caliper measurement for boresize and then plunging it into the cylinder at BDC will enable us to provide quite a bit of info.

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    Quote Originally Posted by eliminator View Post
    working with a unknown ford 460 . the bore just under 4 1/2 and the stroke is 3 15/16 . no numbers anywhere . what would this be?
    Your meanurement of stroke at 3 15/16 could very well be 3 7/8 if you're using a tape measure or ruler, which is very close to the stock 460 stroke of 3.850 (3 7/8 is 3.875) The most common next step in cranks for a BB Ford would be 4.15, so it's not likely you missed by that much.
    The bore at .080 over (not unusual with BB Ford) is 4.44...again, within a 1/16th of, or just under 4 1/2". With the stock stroke, and a bore of 4.44 you're at 476ci. Not likely a 513.
    Last edited by scott foxwell; 03-13-2009 at 09:59 PM.
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    www.highflowdynamics.com LakesOnly's Avatar
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    Quote Originally Posted by steelcomp View Post
    Your meanurement of stroke at 3 15/16 could very well be 3 7/8 if you're using a tape measure or ruler, which is very close to the stock 460 stroke of 3.850 (3 7/8 is 3.875)
    ya know, this is very true....and why we need a more accurate measurent!

    LO
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    Performance Components for the 429/460 Engine Family


    This post © Copyright 2007-2020 Paul Kane. No copying, linking, printing or otherwise without express written permission.

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    here is a more info , it is 4.355 on the bore and 3.982 on the stroke . please remember these measurements are with bloodshot eyes
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    Quote Originally Posted by eliminator View Post
    here is a more info , it is 4.355 on the bore and 3.982 on the stroke . please remember these measurements are with bloodshot eyes
    Bore is 4.36 stock, stroke is 3.85 stock. If you're sure about that stroke, that's an odd ball, but you're looking at 475ci.
    (bore x bore x .7854 x stroke x no. of cylinders)
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    Quote Originally Posted by eliminator View Post
    here is a more info , it is 4.355 on the bore and 3.982 on the stroke . please remember these measurements are with bloodshot eyes
    Sounds like 69sleekcraft has been strewed again? Will try to get by next week to help with the red eyes Scott.

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    Quote Originally Posted by GasGuzzler View Post
    Sounds like 69sleekcraft has been strewed again? Will try to get by next week to help with the red eyes Scott.
    Please stop in and inspect the new anchor . and have a beer or 12 .
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    It's all good. Chris and i will work out something.No harm intended on his behalf. It's a good day have a cold one for me. THANKS

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