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Overhauling my 806

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Joined: 04 Oct 2014
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Location: East central Illinois

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PostPosted: Mon Jun 21, 2021 12:00 pm    Post subject: Re: Overhauling my 806 Reply to specific post Reply with quote

[quote="Dugger"](reply to post at 06:52:08 06/20/21) [/quote]

Hey tractor vet
Where do you take your blocks now
Or can you do it
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Joined: 23 Jul 2009
Posts: 520

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PostPosted: Mon Jul 05, 2021 9:19 am    Post subject: Re: Overhauling my 806 Reply to specific post Reply with quote

You are correct in that core shift happens before or during the pouring process, when the sand cores move out of position before or during pouring the metal. Many cast iron blocks do move around and take a set a bit after use, but that is not the same as core shift. A sonic test can map out the cylinders and detect core shift. An align bore is necessary when main caps have been replaced or are otherwise way out of line, usually an align hone is called for when an engine has been run and still has it's original caps and there has been no incident that disturbs the alignment. Align honing tends to remove less metal and disturbs the relationship with cam tunnel bores etc less, removing metal moves the cam & crank closer together, shortens the deck height etc. Of course the decision on which way to go follows close inspection. Some blocks move more than others, one that almost always benefits from an align hone is the small-block Chebbie. I do a lot of 427 Fords, which can suffer from core shift in the cylinders, but the mains tend to stay pretty stable, but may still need a light align hone to get the bearing crush correct
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