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6.5 na heads/ 6.5 td heads ???

6.5NA, S and F heads are the same except the precups were different in each, but you can buy diamond precups from dieseldepot for like $12 a piece.
 
They will interchange and at stock fueling levels for a DB2 IP: you will not notice. My 6.5 1995 rebuilt and worn out engine had the N/A 6.5 precups in it. I didn't notice. The heads appear to be crack free however.
 
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