Quote:
Originally Posted by markpj23
seriously..... guess they did that to mess with the backyard mechanics ....
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Reverse Idle systems with a fixed idle fuel flow and adjustable air flow has been around since those first Spread Bore carbs were released. They did it for emissions purposed when those first spreadbore carbs were designed.
Turning the screw in removes AIR from the air flue mixture on spreadbore carbs. Turning the screw removes Fuel and Air on
square bore carbs and most other carbs. Well worth the price of one of Mike Urich Holley Books to know this as it has been
in print since the first Holley Spread Bore carbs were sold and written about.
There are even little special tags on the metering blocks that help you know this.
Tom V.