To line2line coat or not to line2line coat ;-)

Thanks guys :-)
The shop I am using does engines for professional racing teams. This is really high $$$ stuff.
Normally they would not touch an engine like mine but I go to them from one of their bigger customers so they do my stuff from time to time as low priority ;-)
Never had any issue.
Sleeving is an option but I would like to avoid it.