This all seems to be an exact repeat of my issue but I had a cracked head too. As for compression testing I subconsciously knew that one cyl was dead so I didnt bother turning fuel off. Car wont start when you have no plugs in it lol, they should all be out during the test.
Blaming the LMS tune goes through my head but then I think that it would never be 1 cyl getting so much heat to crack stuff. Has to be sub par quality motors?
