I think your talking about the little adjuster screw that handles the heat riser valve. It controls the flapper valve that allows either heated manifold air or normal air to enter the motor. It's been a while since i've had to deal with one but basicly, thats how it works.
_________________ Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.
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