And are you sure about your 20 degree +/- 1 BTC magneto to engine figure for all IO520s?
Not IAW MSB94-8D. This SB will also tell you about using the Time Rite device, which in my opinion is the onliest way to time a piston engine in an aeroplane, rotor craft engines of course, have their own arrangement.
Although
LB you may consider the whole MSB documentation old wives tales, and only to be followed if one feels like it.
And we all know why that is, don’t we.
Why would that be? Because I do not know. Sign on the workshop wall here denotes charge out rate as $100 if we do the job, $130 an hour if you stay and watch, $150 an hour if you stay and help.