Helluvadriver,
The pump on the Butler engine is most likely thier low end kit that they sell. They indicated that this kit pulls approximately a max. 6 inches of vacuum and typically runs around 4 to 5.
Goatman,
The vague answer I got when investigating this subject is what vacuum is safe for street use. The answers I got ranged from you can not use one to 13 inches. I feel that the safe value would be around 3 to 6 inches, but have no data. So the valve is a great addition, but what do you set it at. That's maybe why Morosso did not answer. If someone has the number I would be interested as I have a pump for my street car.
65gofast,
I would suggest you call a couple of other suppliers such as Aero space (they will most likely tell you not to run one on the street - gave me a 3 -4 inch after discussion) and talk with Butler (They have a complete kit that they feel is suitable for the street - I have this kit for my car).
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