1/8-1/2 turn, depending on how much wear is in the system. Once you are up to operating temp, loosen the rods and see if the throttle plates are still free, not sticking. A bit of expansion from the heat can cause the plates to bind. A lot of laying on of hands and praying to get it up and running. But once dialed in, they are beautiful. Have 3 engines with that system, one on a street car that has been virtually trouble free for 25 years.
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