| camsaure | -- 04-25-2017 @ 9:33 PM |
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I have a 59 series block that apparently was a replacement for a 221 cubic inch engine. I do know that regular 221 engines could be bored from 3 1/16 out to 239 3 3/16 safely. Question is: is this 59 series block extra thick walled? In other words can it be safely bored even more?
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| TomO | -- 04-26-2017 @ 7:36 AM |
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The maximum overbore recommended by Ford is 0.060. That would bring the bore to approximately 3 5/16. Tom
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| camsaure | -- 04-29-2017 @ 8:30 PM |
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I need a little clarification. Are you saying that a 221 cubic inch block (59 series) can be bored that far, to 3 5/16? In other words 060 oversize for a 3 1/16 block or could that block be bored to 3 3/16 plus 060 oversize? I actually only want to go to 3 3/16 bore (stock 239 bore) but I want to have plenty of meat left for cooling/wall flex etc. This 59 block was factory bored to only 3 1/16. I have other 239 blocks I could use, but this one is pretty nice and the one I would like to use.
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| camsaure | -- 04-29-2017 @ 8:31 PM |
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Sorry, I also should have added a Thankyou for your first reply.
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| TomO | -- 04-30-2017 @ 8:48 AM |
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You should be able to safely bore the block .060 oversize. Your machine shop should check the wall thickness before they bore it. Every block is different. http://www.olympus-ims.com/en/applications/thickness-measurement-cast-engine-blocks-cylinder-bores/ The 59A block was designed to be bored at 3 3/16. I don't know if Ford selected blocks to be bored to the 3 1/16" bore because of cylinder wall thickness, but I doubt that they had the technology or time in the 1940's to do this. Tom
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