F engine number.

[Aussie 25]

I found an f engine with no F 108007 on it . I can't find any reference to engines with 108 for the first 3 digits. haven't seen the block yet so can't get the date off it.
Could it be a truck or forklift engine ;

 

[Cruiser_Nerd]

Fits pretty well in the 1959 range of numbers though.