'88 S-10 Blazer 4.3 currently 221,000 miles, only repair to engine was to replace water pump and while they were that close had them replace the timing chain as well, needs valve guide seals but don't add any oil between 5,000 mile changes
'78 Jeep J-10 360 pickup sold in '02 after buying current D'max, had 400,000+ miles, engine rebuilt once and 2 clutch replacements
'02 3500 D/A just under half way with 45,000+ miles, has run strong with no engine/transmission issues, hope to put more miles on it than I did the J-10
........ Jim