Offy port o sonic 273/318

The Offy Port-O-Sonic was a true single plane intake that was the hot set-up for a while for Mopar small block Super Stock racing with a Thermoquad carb. There weren't any other competitive, decent, small block race intakes at the time. It was modified with epoxy + "popsicle sticks" to even out the flow distribution with the spread bore TQ. This mod was apparently better than a modified LD340 in that application. Holley finally came out with their small block Strip Dominator which needed little, if any, mods to work with spread or square bore carbs & performed better to boot.