[68GMCCustom]

I USED a dual plane....now its an efi truck intake.

OK...........its REAL simple if you want to look at it that way. If doing much of anything except racing you want the dual plane. the single plane is worse at making power at lower rpm levels off idle to 2500-3500rpm...where a street car/truck lives. that same rpm range is where a single plane just starts to make power on its way to 6000, 7000 rpm, or more.

street or street strip use...............dual plane.
mean street/mostly strip/racing use..........single plane.