[GeorgiaSnake]

I bought the Quick change kit with the assortment of springs. I can't tell you how much better the car runs with the lighter spring. I'm running a 4150 on my stroker motor and based on the Holley charts the standard spring starts to open (on a 400 ci motor) at 1960 rpm and doesn't fully open until 7130 rpm. I'm running the yellow standard lenght now and the throttle response is very different, opens at 1420 rpm and fully opens at 5020 rpm.

Randy