Junk Yard Engine Build
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Junk Yard Engine Build

  1. #1
    Senior Member 78Southwind's Avatar
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    Default Junk Yard Engine Build

    A friend and I are looking at building an engine from spare parts. We are looking at a Gen 6 standard 502 block that is currently a 565. The bore is 4.535 and the stroke is 4.375. We don't know the condition of the block yet but we were wondering if it needs to be bored out what would be the next bore level (4.56)? This is not a Bowtie block. I have also read some old forum posts and some say you can't and some say can go all the way out to a 4.6 bore. I am sure either way we will have to get it sonic checked.
    Last edited by 78Southwind; 01-27-2020 at 05:42 PM.
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  3. #2
    Some guy obnoxious001's Avatar
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    Quote Originally Posted by 78Southwind View Post
    A friend and I are looking at building an engine from spare parts. We are looking at a Gen 6 standard 502 block that is currently a 565. The bore is 4.535 and the stroke is 4.375. We don't know the condition of the block yet but we were wondering if it needs to be bored out what would be the next bore level (4.56)? This is not a Bowtie block. I have also read some old forum posts and some say you can't and some say can go all the way out to a 4.6 bore. I am sure either way we will have to get it sonic checked.
    I would feel better just honing a few thousandths and having pistons made if that's possible. .060" over is supposed to be max on those blocks. Racetec will make up the pistons without breaking the bank, but make sure that rings are available in the size you are looking at. Make sure if they did any clearance work for the existing crank that it's not a hack job.
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  4. #3
    Village Idiot fc-Pilot's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    I would feel better just honing a few thousandths and having pistons made if that's possible. .060" over is supposed to be max on those blocks. Racetec will make up the pistons without breaking the bank, but make sure that rings are available in the size you are looking at. Make sure if they did any clearance work for the existing crank that it's not a hack job.
    Depending how "junk yard" this build will be, you could do as Barry said and hone it a thou or two and either have pistons made, or if the other pistons are in decent shape have Line2Line coat the skirts and reuse them. depending on what you are expecting for power and longevity might be my determining factor. But if the skirts and ring lands look good and they have not been munched I might reuse the pistons. It is just a thought anyway to kick around some other ideas. Also depending on the application a short fill of the block might not be a terrible thing. Also, depending on the cost of custom pistons vs off the shelf, you may find and off the shelf piston and have Line2line coat it still for less than the custom pistons. I have not ordered customs in a while so I don't know current cost these days. I am sure Barry would have a much better idea than I.

    Anyway, just more idea. I love low budget builds!

    Paul
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