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Use as much diameter and wall as you can stand, if the heads need clearanced then so be it, but if you won't do that then -

Double tapered 5/16"-11/32"-5/16" .120" wall and 5/16"-3/8"-5/16" .145" wall are available.

Wrap some tape on an old straight pushrod and mock up in the long block, keep adding tape until you notice interference, then back off on diameter about .020"-.030" or so at that interference point.

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