What is this sidevalve barrel?

[VintageBike]

Can anyone help me identify this NOS barrel from my garage?

No part numbers to help us....

[VintageBike]

..

[33d6]

The inlet port appears to slope downward. If so it is probably either the front barrel off a vee twin or the barrel from a 'sloper' single.
The sloper fashion was started by BSA in the late 20's and the cast in valve chest as used on this barrel was a late 20's innovation also.
BSA liked to use that style of valve cap rather than the fircone style used by other makers.
BSA made both vee-twins and sloper singles using this style of barrel so I lean towards it being BSA.
I'll be interested to know what it is if you get a firm identification.
Cheers,

[m3bobby]

This is a difficult one, I dont know of any manufactures who made a barrel with integral head and a timing chest cover. And its a 2 screw cover rather than the single point fixing of most manufactures.

I had a look at various 1920-30's BSA sidevalve engines and nearly all had BSA cast into the barrell.

I'm wundering if this could be a barrell from a stationary engine or similar?