I'm getting ready to rebuild a '99 6.5. Its in a C3500 van and was partly torn down several years ago. One head was removed and exposed the cylinders to the elements. The Cyl walls are corroded a little. I did find the mechanic that did the initial teardown and learned that the head was cracked. The vehicle was driven up until the teardown. The owner did not want to send the $$ on replacing the heads. So I plan to remove the engine, have the other hear checked, have the block checked and bored, then rebuild her. My first diesel rebuild, hell my first diesel anything, other than driving and servicing. Any other suggestions.