Anyone changing to a flex fan. Get a 19".
I have found that placing it 1/3 into the shroud will make it almost 1/2 way in @ idle. Never had a proplem in 30yr's.
As the others have said, as long as you have good air and water flow, fuel and timing are usually the problem.
After setting timing, try ajusting the idle mixture with a vacuum gauge.
Shoot for a steady needle at the highest reading.
You may find it idles smoother at a lower vacuum reading then whats considered ideal.
For instance, on my car, i can get 14", but it runs better/smoother @ 12-13". The needle is more steady.
A good free flowing dual exhaust helps alot also.
I havent noticed a difference with octanes @ idle, but for street i have stayed under 10-1 comp.
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If you cant drive from gas pump to gas pump across the map, its not a street car.
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