I lost a piece of valve after having a speed contest with a 4.3L S10. A little over 100,000 miles prior I replaced the head gasket, at that time it was hot tanked, milled, and I cleaned and lapped the valves. This head is showing about 250 quarts of consumed oil, mostly on one cylinder. Despite the oil burning this car runs great and still gets fuel economy over EPA numbers. There are two deep scores on the bad cylinder. Around 240,000 miles a perfectly good NGK plug dropped a piece of electrode into the cylinder while I was driving. Sadly, that turned a car that burned no oil into one that consumed a quart ever 1000 miles and turned oil black in short time.
All that carbon was probably like a charcoal briquette. Sorry, I don't have a good picture of the scores or the piston tops. Piston tops look pretty good. The scores you can stick your nail into, though I remember them being deeper when I first saw them 100,000 ago.
All that carbon was probably like a charcoal briquette. Sorry, I don't have a good picture of the scores or the piston tops. Piston tops look pretty good. The scores you can stick your nail into, though I remember them being deeper when I first saw them 100,000 ago.