440 - 2v

Maybe they were on 413-426 industial engines but I do not believe they were ever put on a 440 from factory and I've seen hundreds of engines and farm/industrial ones including hemis with 2bbls but not once ever a 440...so NOPE..never happened from factory...now someone could have changed one out to a 2bbl manifold and have seen adaptors from 4 to 2 bbl on a 440 once and it didnt like it...kinda like a 440 hemi,never in production..sorry