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The regulator is adjustable for the maximum vacuum that be generated in the crankcase.
Why it adjustable up to 29 inches (near perfect vacuum) is anybody's guess.
Here's another type:
http://www.gzmotorsports.com/VCV102B...rol-Valve.html
__________________
Gary
Gold Certified Holden Technician
Last edited by Gaz64; 11-30-2012 at 06:30 PM..
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