Hey guys! got me a 1986 f 250 with 6.9. bought truck not running but guy i got it from said the last time it did run it smoked really bad. what you think? head gaskets? air in injection system? pin holes in block or worse? read up alot on these engines and really want to stick with the 6.9. will be pulling engine and heads anyway but don't really want to take down short block at this time. open for all sorts of suggestions.

thanks for any input.
:shrug: