1951 truck engine letters

[Bums]

I have a quetion about engine letters. I have found the meaning of the letters JBA: but I have a fourth letter " I " . It reads "JBAI"then the serial number. Any ideas?

 

[vwnate1]

Go over to The InLiners group , they have all the various casting and serial number decoders you could ever want .

Come back and tell us what it's all about when you know .