I took my engine to a very reputable machine shop I've used for years these guys have never done me wrong with any work I've ever taken to them. They advised me to look somewhere else, that the cylinder in question tho showing sings of marking, is not scored. They said that a scored cylinder normally will transfer its heat over to the piston skirt. Which of course ist the case with this cylinder in question. He also said that a sored cylinder , and I already knew this will not hold pressure like this cylinder is doing. He believes the isuues are valve train related since their showing after oil changes, and that usually what comes about after oil changes. They said they understand that the modulars don't have the normal type of hyd lifters but that the hyd followers are still of hyd bleed type and carry the same principal of normal lifters.