Head stud to block

[JayJay]

Originally Posted by Bruce of MN

To straighten it out and use a thicker wall insert like this would be pretty tough unless the bare block was on a mill.

I used that insert on my motor and as mentioned above, used the head as a drill guide and checked the tap for squareness every quarter turn. It came out well.

It can be done well. It also can be, and more often is, done not well. The latter is what happened to my block. Fortunately taking the head on and off is not a frequent operation.