[Caprimaniac]

Yes, Rick- that's the one. Although what I have is the standard version with one cam in block only and 3 litres, not 3,4-3,5. It was used alot in the US in fromula 5000 (if remembering correctly).

Barrels have been balanced, but I'll double check it.

Gary; yes- I think you are in to something on the ignition timing. There's no inter- balancing between the runners, no.
I have no numbers, but I know the mechanical advance starts early; maybe at 1000 rpm.

I will experiment with vacum advance removed. If I'm lucky I will borrow a vacum reader for MC from a friend.

But IF the reason for the hanging idle is the hard running idle circuit combined with more mechanical advance, what can be done to make it better?

Maybe put in harder springs? Have some lying around; will do some experimenting here as well.

Thanks. Even though not Cobra, V8 or IDA- related, it's great to have a bunch of people who's willing to discuss weber- carburation and general engine-subjects.

Runs