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I have been so so careful with this build that I must have spent at least twenty minutes per cylinder wall making sure they were clean with atf etc. And they were spotless.
Installed my new rings on the pistons yesterday. Made sure they were clean too. Oiled the cylinders lightly and the skirts and ring lands.
After turning the crank a few times to do 7 and 8 I noticed vertical marks on the cylinder walls!!!
I can't feel any of them with a fingernail, but as you can see the marks are there.
Out of frustration I wiped a cylinder wall and it came up dark? They and the rings were cleaned beyond an inch of their life, how can there be black stuff showing now?
They are JE pistons and rings., rings are part number JG31F8-4070-0
Nitrate 1.2x1.5x3.0
Either the rings are cutting in on the micro grooves of the cylinders, or the microgrooves are burnishing the rings, I think either way thats pretty normal. How was your end gap on the rings in the cylinder before install?
Thanks for that! Will they disappear over time or become more prominent? I see people who open their heads at 50000 and it still looks perfectly honed, or will mine still have the streaks?
End gap was checked within spec and filed accordingly by my machine shop.
Yep if you pull an oil sample on the first oil change its amazing how much iron is in the oil. Then the second change its almost gone.
RUN high zinc/suphur break in oil, Joe gibbs sells one as do others... Google cam break-in and the Compucam paper on it. The surfaces of your new cam and lifters will thank you..
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Ls3 new piston and rings vertical marks??? 
