After 20 years my 1941 9N finally started leaking around the #4 cylinder. Block is pitted (probably prior to my ownership) and manifold is also pitted. New manifold is on order. Will follow Bruce(VA)'s tip #53 for the block pitting. Again, prior to me the stud by #4 is broken with about 1/2 inch of usable threads in the block for a bolt. Someone tried to remove the stud because it has been drilled through to the water jacket. I am hitting it with PB Blaster until the new manifold arrives.
Any opinions on the odds of getting the remainder of the old stud out after being stuck for more than 20 years?