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 - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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