blow by and wierd plug

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May 19, 2000
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#1
I was wondering if the browning on the exhaust side of the piston is indeed blow-by. The light brown extends in a half moon shape ~1/4 of the way down the piston. Is this normal? Interesting to note that the plug has pits on the cap(screw on piece)any body ever seen that? is it bad? Oh yeah comp test reads 210 psi same as few weeks ago:think wish i had pics
Thanks
bp