The likelihood of a spring breaking is remote. Matter of fact, the only ones I’ve seen broken are ones where someone bent the springs for another purpose.
I think your Holley has a spring built on it (which you can test by removing both springs, move throttle back some, and see if throttle will return back. If it does, then one spring will work fine.
In this picture, you can see the built in carburetor spring, as defined by the blue arrow.
Back in my younger days, I put a third spring on car thinking that increased throttle pressure - would make me go slower (to see if I could get less speeding tickets). It worked, but it also caused my throttle cable to break a short time later.
I think it was a lot cheaper for Chrysler to build the engines with two springs - than having the possibility of lawsuits down the road (I could be wrong),
I think your Holley has a spring built on it (which you can test by removing both springs, move throttle back some, and see if throttle will return back. If it does, then one spring will work fine.
In this picture, you can see the built in carburetor spring, as defined by the blue arrow.
Back in my younger days, I put a third spring on car thinking that increased throttle pressure - would make me go slower (to see if I could get less speeding tickets). It worked, but it also caused my throttle cable to break a short time later.
I think it was a lot cheaper for Chrysler to build the engines with two springs - than having the possibility of lawsuits down the road (I could be wrong),
