Water pump bolts

Dana67Dart said
You can take a piece of wire and see how deep the hole is till you hit the cyl wall or the like

V8 Sam said
Wire coat hanger time then

(YELLING) HAVE YOU PUT A LONG WIRE IN THE HOLE TO SEE THE MAXIMUM DEPTH OF THE HOLE!

not yelling... If you put a small bend on the end of the wire you can find the inner lip of the cast iron that you are trying to screw the bolt into