Flathead bearings - red/blue sizes?

onthehunt

onthehunt

Junior Member
Hi All,
I'm going through a few boxes of flathead bearings and found several with odd dimensions.

For example, I've got a set labeled "ICM-6333-A Red .0852-.0855 and Blue .0855-.0858"


Can anyone explain the color/sizing? I've never run across these before and am not finding anything in my books.
 
Ahh, thanks! I wasn't considering the shell thickness. Were odd journal sizes really that common? I've come across piles of bearings over the years but never the reds and blues.
 
This is from 1949-53 Mercury parts book.
1CM-6333-B (Red Size) crankshaft dia 2.498"/ 2.499 (Std)
Block main Bearing Bore 2.675"/2.671" (Std) Overall Length
1.49"/1.506" (Std)
It shows the same dimensions for 1CM-6333-C (Blue Size)
 
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