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Weber no longer makes 40IDA carbs. PMO took the Weber design and improved upon it and sells 40, 46 and 50mm versions of the "IDA" - $2100-$2300 per pair. They also have ported manifolds, linkage, parts, etc. They don't have a website as far as I know. Here's the contact info:
FAX: 310-394-6313
135 17th St.
Santa Monica, CA 90402
The tennis balls? Used just like you said, but in race cars without air filters over the velocity stacks. -- Curt
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