And what if the EGT's ar telling porky's
How is that possible?
With the common
EDM-type instrument you get a bargraph for each engine. You can see immediately if there is something wrong.
The only way I can see of getting the "correct" EGTs is if the crankshaft snaps off right behind the prop (the prop comes off) and at the same time there is a fuel flow obstruction which reduces the fuel flow "just right" to maintain the expected EGTs.