Originally Posted By Trick Flow

TFS-6161T783-C00 1.550" dual valve springs and titanium retainers, 240cc intake runners
TFS-6161T784-C00 1.560" dual valve springs and titanium retainers, 240cc intake runners

Can you provide more info on the spring specs that are used w/ the 6161T783-C00 and 6161T784-C00 versions? Thanks.