a couple weeks ago I pressure checked the cooling system. no leaks. also did the cold coolant line squeeze check to see if the head is cracked. Line was soft, so no crack. So i can't believe it blew a head gasket from just sitting there and never overheating. Also, the car got about 500 feet before it died - never even warmed up.

so, back to original questions above . . .

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1986 300 SDL, gray on black, #14 head, 180K miles
1982 300 CD, silver on palomino, 290K+ miles [sold]
1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above]