Hello all! Been about 18 years since my last post, but I finally have a 996 911. I just dropped the engine to freshen up things and to fix the cam deviation issue I just found out I have. I thought I would run a bore scope down the cylinders while I have it on the cart and this is what I found in cyl 3 and 6. Things looked pretty decent from the sump side, but from the spark plug holes I see what may be cracks. The Line is at about 9 o clock on #3 and #6. Please help with what you think this may be. Crossing my fingers. Thanks in advance.

 

You cannot have cracks in the cylinders and not have misfire too. That could be something else, like oil lines.

 

I’m trying to figure a way to wipe that line or crack to see if it goes away. I’ll try to get better pics as well. If it’s not oil, I can’t imagine what it could be. It doesn’t go away when Turing the crank.

 

Those lines r normal and not cracks.