The International Cessna 170 Association

Continental shows the ring set for the chrome barrel to be p/n 653394. They are available from an online auction site where it has the following picture displaying the individual rings:What doesn't make sense is that these rings in the O-300 IPC are not the ones listed for chrome cylinders. Misprint in the IPC?

Likely a “superceded” part number situation…. AND another example of how an “online auciton” site can be problematical when sourcing parts. That PN 693394 is available at the same price directly from a more reliable source….AircraftSpruce/Superior…..

https://www.aircraftspruce.com/catalog/ ... ngset1.php