[MIKE SCHULZ]

Gentlemen;I have read several posts but none seem to tell me enough information about how to perform this "Drill Bit Test" - so next time I am at the junkyard on my back covered in Goop - I can be reasonably sure that the block I am looking at could have the thicker cylinder walls. I have 2 D4TE blocks with the webbing and I punched out the freeze plugs.Can anyone inform me as to how I go about doing this??.....Thanks!....Mike Schulz