RE: McCoy redhead stunt engines
I have two of the lightning bolt dull case .19's one CL and one RC..both have a bronze bushing. I'm sure the .29, .35 and .40 did too because the entire line received upgrades at the same time.
I have three of the older shiny case .35's and two .19's and they appear to have an iron bearing. I'd have to disassemble to make sure.
My only problem with the older shiny case .19 was that it kept blowing the fiber head gasket. After a while the screws got a little messed up and it was hard to tighten them. Today I would convert to socket head screws and an aluminum head gasket.
I had a lot of fun with .19's flying them on Jr Satan and Flite Streak Jr. models. I used the K&B greenhead, Fox and Testors/McCoy engines. They all had good power.