A7 Longstroke - Timing Cover

[Happyhenry]

Question:

When did the piled arms start appearing on the timing chest cover of the A7 longstroke?

Was it only on the Star Twin, or did the 'cooking model' have it at some point?

Thanks

[Happyhenry]

Answer:

Found the answer. I think. There was an early case with a flat bottom and from about 1947/8 they had an extra fixing bottom-centre. The 'cooking models' were plain covers and the Star Twin had the piled arms engraved on it.

I ask because I have a 1949 A7 with a plan cover, a spare plain cover and a spare standard engine which has a piled arms cover.

H