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I just haven't had the time to sit & ponder it out, but I
betcha it's for preserving an engine just a guess.
Cheers
Paul
NC2273H
Are sure this is not a trick question? Can I take a guess?
There are four places this would happen. For example one would be about 30-40 degrees ABDC (After Bottom Dead Center) depending on the cam. The engine would be something like this:
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