12K miles ?? WOW, what kind of rings were you using? I always use moly rings and run straight 30W oil to break in, after about 500-1000 miles they will be seated properly. In fact, if you baby the engine they will not break in at all and it could take a long time afterwards or forever. The ticket is not to baby it. Don't run high or constant revs, vary the rpms and do some full throttle accelerating to about 3500-4000 rpm a couple of times, also do some engine breaking. This will increase cylinder pressure and force the rings into the walls almost instantly seating them.
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