The 421 a good airplane.....GTISO 520 a good engine....OK have you ever worked on one? Not a great design...but I'm a PA-31/Lyc dude. All the clunanental stuff is junk to me. Twin Cessnas make me laugh.....421B and its 9 tx pumps, great design...golden turkey! :!: Its quite an achivement to be the w...

The GTISO 520 on the Cessna 421 is a junk engine if you have 3 pilots on the same plane. Shock cooling can be done easy and I've seen green pilots ball up the gearbox aswell.

The engine it self is only as good as the guy in the left seat.