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carbon
It's fine now.The previous owner used regular oil, and changed it seldom.I used a borescope to check it and it is clean now.I use techron every other tank most of the time.And no plugs have closed in a long time now.It first happened on a long descent using engine braking.I figure the thermal shock popped off a chunk.
I found some sites that sell disks that fit 14 inch wheels.I will have to get some.I swear I couldn't find any before...I guess my google-fu was off.
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