Sorry, but I don't agree.
The fact is that I want to make the manifold before I do anything about carbies.
In any event, the info requested is hardly a state secret and should be available as a service.
If I was making the manifolds in bulk for sale to other Datto people, I bet the attitude would be different, because each manifold would most likely have one or more of their products on it.

I think their response was reasonable. It's not something they would need to have on file. They could have said that maybe.

Buy your carbies before making the manifold, then you don't need to ask them for anything.

Chris.

A couple of weeks ago, I emailed Holley Aust. (In case everyone doesn't know, Holley have owned Weber for years.) All I wanted was a sketch of the layout of the bolt holes on the mounting flange of a 45DCOE.
They came back after a couple of days asking me to consider one of their manifolds.
I went back explaining that the manifold I was making was for a race car and that theirs would not suit.
The silence from then has been deafening.

Weber make a great carby, pity about the crap back up service.