As little as possibleI assume you are doing this to up the compression ratio a bit? In that case sorry have no experience with them. I would leave a good safety margin though as you don't want to go all out and then need to skim the head again and be unable to.


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I assume you are doing this to up the compression ratio a bit? In that case sorry have no experience with them. I would leave a good safety margin though as you don't want to go all out and then need to skim the head again and be unable to.

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