RE: Most reliable engines made by the Big Three
My votes in the Mopar Camp would be for the slant-six, and the 383. In the 1964 (or earlier) World's Fair, engines from all over the world were put on display (this is what my stepdad tells me), drained of oil, and ran. The last engine standing was a Studebaker V-8.
The Buick V6 is a tough motor, and has been around for almost fourty years, starting in '63, I think, living in the seventies as an AMC jeep motor (they purchased the tooling), and re-emerging under the tri shield in the early eighties.
Ford? Well, its ford...
Later