.....I'm going to stick my neck out here and claim that the 6.2L Ford gas engine is the best gas engine they have ever built...
I had a 300 CID straight six, that would've been a close second. It wasn't called on for extreme duty, but it could turn low revs and go slow. Pulled and carried way beyond recommended, lol.
A guy I worked with who bought a dairy farm swore by those engines. But, he also had a 390 that he said the same thing about, I found it strange that the main bearings got engine oil after the lifters did, but, didn’t argue with him. It wouldn’t have seen high RPMs under him, anyway.
Same farmer had a relative that had a GMC 5.7 diesel that crapped out (they did that). Out of a wrecking yard near Grasston, MN, they pulled a rabbit out of a hat, and ended up with an Oldsmobile L33 engine, a high compression 2 barrel carburetor 455. Into the GMC it went, and, although a bit thirsty (maybe not for Stan) it has been an outstanding farm pickup. The old guy made the comment he had to be careful when he pulled stumps or he might “tip the world over”. Made me laugh.
I like the notion of keeping an old piece of equipment running. But these guys have made an art form of it.
Best,
Ted