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Yes you can! We have stacked 4 black with 4 reds before and had great luck with them! But the best setup is 4 blacks after your run a couple races with 2 black and 2 whites across form each other. We ran the 4 blacks with reds in Sr class. Also ran the 4 blacks in sr as well with great results!
 
Yes, quite common in sprint road race. If you are stacking whites and blacks together you are running something with a lot more power.
 
We are running 206 sr. 400# class, dirt oval. Usually always run 2 black and 2 white. Has anyone had great success running 4 black springs? Never crossed my mind to try it.
 
We are running 206 sr. 400# class, dirt oval. Usually always run 2 black and 2 white. Has anyone had great success running 4 black springs? Never crossed my mind to try it.

Lots of success with 4 black springs with a clone @ 375 I would imagine there would not be much difference from 206 to clone engagement rpm.
 
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