That's a whole new topic.

Better lubricants and better fuel metering likely have a lot to do with the longevity of today's motors. Another factor would be overdrive transmissions.

I have a '91 Chevy 350 with more than 190,000 miles on it. I agree cars today do seem to last longer but there are reasons that you can apply to the old motors and get better life from them too.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...