I just bought a 360 off Craigslist. He sold it as a 318 (he's an import guy so he didn't know what he had) but once I scrubbed the dirt off the block I discovered it is a 1990 360 with a roller cam, that was run off propane. After opening it up I discovered it had been rebuilt at least once (as evidenced by the .040" Sealed Power pistons). All of the cylinders have a slight ridge at the top of the bores, barely enough to catch a fingernail, but one cylinder has a half inch long horizontal scratch that's deep enough to catch a fingernail. I also found the cause of the scratch, a piece of oil ring was in the oil pan. Since I'm looking at having it bored to the next size, is it really safe to go 060" over? I've heard these were thin walled and would run hot but I don't know.

I'm not looking for a street/strip warrior, just a daily driver engine to replace the aged slant six in my 84 D100.