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pop goes the B18 120-130

For the past few months when I shut down the warmed up the B18 (with a little over 100K on it) in my 122 I can count 1...2...3, then I hear a pop through the exhaust. It's not consistent, but rather happens about every five shutdowns. I haven't noticed any other symptoms but I am wondering if the popping is indicative of a more serious problem, like maybe the valves are starting to go.
During the winter I have been using "dry gas" and I use the lead substitute additive always. Recently I adjusted the valves, and even double checked them.
Any thoughts?






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