19FB What do the letters mean?

[B-16_IC 1,029]

I bought this Briggs at an auction last Saturday. I was wondering what the FB means, I know with my old letter series Wisconsins the more letters the better(more options). I was suprised to see a CJ-8 plug screwed in it, thought it should be bigger? Any help is greatly appreciated!

[SmilinSam 3,819]

Flange Bearing The Model 19's on the 700/725/ B-1 tractors and the Model 23 on the early Landlord and B10 all have a visually cupped type bearing plate on the PTO side of the engine. The FB engines have a flat bearing plate.

[B-16_IC 1,029]

Ah! It seems so simple now! Thank you for the knowledge Sam!!:D

[Learning 6]

Hey Sam, What would it take to convert a 19 FB to a 19 like the one on a Simplicity? A new cam and a bearing plate? Just curious. Thanks.