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Old 11-09-2002, 10:07 PM
DEMON SIZZLER DEMON SIZZLER is offline
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Join Date: Jan 2001
Location: STONE MT, GA U.S.A.
Age: 62
Posts: 235
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Brian, I have a "custom" made ream with a pilot that is specifically for carbs with 3/8" shafts and I have used it successfully; the downside costwise is that the bushing(one is usually all that is needed)installation will require that the butterfly screws-all four on the primaries will have to be removed
by drilling the staked portion, removal of the shafts/tension springs/spacers. Then the shaft/associated parts will have to be
put back in the based plate and new screws will have to be installed, staked and contoured for air flow. This will cost $35 plus $5 per bushing, but it will be done right the first time.

Dynorad, for "tuning" the 2ndaries, for each .100" you adjust the vertical opening of the air door, you will notice a difference in performance; thus if you close down the vertical travel of the air door, you will:
a)richen the 2ndaries for two reasons:
1)there is less air entering into the 2ndaries,
2)the closer the 2 air door dimples are to the spray bars, the "stronger" the venturi effect is and this will pull more gas from the spray bars.
b)conversely when the air door dimples are farther from the spray
bars, the mixture will lean because:
1)there is more air entering into the 2ndaries,
2)the venturi effect is weaker and consequently there is less gas pulled from the spray bars.
Depending on the jet size on a stock T.Q., and the catual engine it is used on, will also effect the overall jetting of the 2ndaries but to less degree than the vertical travel of the air door.
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