Allan, I don't often disagree with your diagnostics but in this case I would make an argument for the exhaust causing the problem rather than an intake valve.
An exhaust valve not opening or one that does stay open for the proper duration will cause a more pronounced popping in the intake manifold than a problem with an intake valve. An engine can have good compression in a cylinder with a non functioning exhaust valve because air can enter through the intake but will pop when the intake opens because the compressed air is still in the cylinder when the valve opens. An intake problem will cause a loss of compression in the cylinder making it less likely to make a sharp popping noise.
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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