Dual conical valve springs

Finished up the dyno testing using the dual conical valve springs on my low deck 470. This engine has the Trick Flow 270 heads and a big solid roller cam. Everything worked great and we made around 750 hp at 7000 rpm. The springs worked just fine with the super aggressive solid roller cam. Here is a link: Dyno Tested: Dual Conical Valve Springs - Hot Rod Network