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I’m not sure what spring you’re using but just FYI.
Holley Book shows,
White is the lightest (I have never seen white or short yellow) they don’t give rpm for this one.
Yellow (short) lighter, is next starts to open at1620 rpm, full open at 5680.
Yellow (long) light, (this is the one I have used the most) starts to open at 1635 full at 5750.
This is for 350ci and about 200 rpm sooner for 400ci.
At your own risk!!, instert a small sheet metal screw in front of the link between the primary and secondary linkage bar, this bar is to shut the secondary, so if you put the screw in the slot in front of the bar on the drivers side of the carb and it will become a mech. secondary and open instantly.
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