Good call.i would consider dropping the oil pan and checking/cleaning it out. i could see the pickup being partially plugged with that much sludge in the valley.
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Good call.i would consider dropping the oil pan and checking/cleaning it out. i could see the pickup being partially plugged with that much sludge in the valley.
My opinion only. If I change lifters, I change the thunder stick.
I completely agree with what you said about the cooling system. I have worked on a 1991 K2500 with a 5.7, for the wife of an American Legion friend of mine, that recently passed. It is her truck. The pics I am about to post speak for themselves. I have only once changed the oil on it and it was very black and had small chunks in it. I have warned her and she said she would have the cooling system flushed out. I told her it would do no good.lemme see if I got all this right ---- current owner has only a few recent months history.
1997 5.7L Vortec, 27 years, 196700 miles, 17 owners, heavy HEAVY sludge and/or coking in valley.
Believe you me, with all that, the COOLANT jackets in both block And heads are Also HEAVILY fouled with scale + sediment + rusty muck. Filthy jackets Cannot efficiently transfer heat from motor to the coolant; too much of that heat is transferring to the Oil. A simple flush with water or wimpy liquid flushes on today's parts store shelves ain't gonna cut that crud; literally. You need a Strong Chemical CLEANING --- Google Oxalic Acid (DAP wood bleach). Job REQUIRES R&R block's drain plugs on Both sides. Reference GM TSB# 99-06-02-012D as good guidance.