If your weld dot at the end of the crack is full penetration, you really don't need to drill the ends. But it's a good idea. 1/16 inch should be adequate. The bigger the hole, the more weld metal (shrinkage), and harder to fill.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
