FD 5000-6610 Engine number

[russn1949]

FD 5000-6610 Engine number
what is the meaning of the T numbers (T1,T2,T3,T5,T7) stamped on the right side of the engine? Newer engines are webbed and have no T number. Thanks

 

[DT86]

By FD do you mean FORD 5000 - 6610?

 

[russn1949]

Yes, I did mean Ford tractor engines. I see these T numbers on the 5000,5610,6610 and other Ford tractor engines and they must have some meaning or they would not be stamped very prominently in the block