This was on a 350 Chevy in a boat. I had done a hone, ring, and bearing job, sent the heads off and had them worked.
Put it all together, took it for a test run, all seemed good, ran good. Told the customer to take it easy the first few hours.
I suspect his idea of break in though, was to run it wide open, see if he could blow it up under warranty, just struck me as that type person.
Well, the next Monday, there it was, no compression on one cylinder...
I pulled the head, the intake valve was rusty red, like it had been glowing hot. The center was pulled in to a cone shape, and about a 1/32" gap all the way around. Didn't appear to be any damage to the piston, no evidence anything had hit the piston or valve. Took the head back to the shop that did them, they replaced the valve, cleaned up the seat. Said they had never seen that happen either.
Put it back together, guess it worked, no more complaints.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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