Hi
Have just had to replace my engine in my 1988 bighorn after fram oil filter seal let me down causing terminal engine damage (not happy about it but fram say oil filter not to blame) luckily i had a 1987 4jb1t in my spare parts truck this engine has done around 320000km
engine is running and starting really well plenty of power Ive been experiencing some amounts off blue smoke if i rev the engine and after pulling away from idle ive a just about except-able oil back pressure and venting of fumes from the rocker cover and dip stick shaft only when engine is at full running temp
could this be the rings or possibly the turbo or valve seals
as i am new to this forum any reliable info on how i can diagnose this problem would be greatly appreciated
thanks steve