Casting numbers transmission chief

[hairynob24]

G day, I have a question about the 40s chief tower's. Besidr the detent adjusting bolt I have 3 x tower's 2 have a casting number . E7 next one has a L5 and the 3rd one which I believe is a 30s tower hasn't any numbers , just curious on this amazing Anzac day in Oz cheers for any info rob

[tfburke3]

24-31 tower is 3.5 inches tall with studs for tower cap and a female ball lock cap for detent,
36-42 will have no web on tower under bellcrank ,with one high boss for chain gaurd mount.
Earlier 32-35 are same but two high bosses for chain gaurd mount.
44-51 have web under Bell crank,one hole for detent.
52-53 have fill cap screw added like the engine timing hole.
Credit toJerry Hatfield for documenting this stuff in his Restoration Guide.
Tom