I've owned a lot of Chevy big blocks and have worked them all hard.
One thing consistent with all of them when worked hard is they break down the additives in the oil then start consuming it.
You do an oil change then drive it for 4000-5000 miles without using a drop then suddenly it needs a quart, then another, then another...
Change the oil and it's good for another 4000-5000.
Being that you are working yours hard it is conceivable the same may apply.
Second thought;
Downshifting and engine braking (pretty common on old overloaded 3 tons with questionable brakes) the increase in vacuum during deceleration will pull oil past the rings and valve guides on a tired engine.
Last thought that may or ay not apply to your truck, aftermarket valve covers did not always come with the proper baffles to properly shield the PCV valve from sucking in oil mist.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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