Slant heat riser block off/delete?

My Offy dual 1 barrels and Dutra Duals have no heat riser and will right up and be ready to go in a minute or two down into the 50's as well.
Says the guy from the warmest and driest part of the U.S.

I can still remember a sand buggy at the NAS Miramar auto hobby shop in the early 70's. Had a hot rod sheet metal / tube manifold, and I don't remember whether it was a corvair or VW engine. You blip the engine ON A 100 DEGREE DAY and there was ICE under the carb cavity.