Yeah ,I own a ford ,I would not know of all this engine rebuild stuff ,my 1986 mustang 5.0 has over 250,000 miles on it and I finally changed the spark plug wires from the factory ones a couple years ago
I figured they were due after 20 years......still passes cali emissions like a new car..

My 460 big block truck has over 250,000 miles on it and I just fired it up after sitting for 2 years and it started like it ran the day before......

I did just build a chevy engine ,they always come in pieces and need to be put together and rebuilt.....


I have seen chevy motors with alot of miles on them before,but not near as many as ford motors.

Fuel injection has made the biggest difference in motor life now that almost all motors are fuel injected they seem to last alot better than before.