you said, The rear bank is suspect because of the AF running out the tailpipe so easily, that is where i found AF puddle on the piston, and the head bolts were not as tight. "but engine has been running fine".

those 2 statements dont belong on the same post. if you got AF running out of the tailpipe then you got a miss. if you got AF running out of you tailpipes i wouldnt put the heads back on until i found out where it came from. a crack in a alum. head would be a good place to look.