[Alex V.]

I'll hold out some belief in the capability of the old engines until someone comes along to offer an opinion that has driven or worked on quite a few, rather than those that just see the horsepower numbers and that it's a 2 barrel and figure it can't possibly be driveable in this day and age, or those that judge a 454 1-ton on how a 305 shortbed performed towing their camaro.

From looking at the specs and construction of the old GMC V-6's and 8's, they were built for some serious duty and did it on oils that were probably more used up at 1,000 miles than today's oils are at 10,000. I constantly wonder, all the 50's, 60's, and 70's engines that commonly wore out not long after passing 100,000 miles - how would that rule of thumb have changed strictly by using the quality of lubricants we have today?