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One light spring, interesting 
How soon do you get full advance with that setup (MSD dizzy)?
as soon as it starts
problem only running one spring is you some time get rpm's going up and down. if you run one light silver and one light blue it will keep it stable and accomplish the same thing 
The silver springs are the lightest, correct?
Why use a blue spring then? 
I think I have two silvers in mine at the moment.
Doug
1967 "Pedal Car" 500" low deck , TF 727, 4.30 Locker
Best to Date: 11.67 @ 114.9 1.64 60ft
"Kids in cars cause accidents. Accidents in cars cause kids..."
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