My only personal experience with the SD was on a 440 with a 10 inch 3500 converter. It worked well , but the old Torker I had on it before 60fted a tiny bit better. SD was about 1 mph faster in the 1/4 than the Torker for me. I wouldn't want to use a SD or any other single plane on a 383 with a low stall converter. The SD in this particular test had a weak low end compared to any of the dual planes :
https://www.hotrod.com/articles/hrdp-0712-mopar-intake-manifold-comparo/ I was going to reference that shoot out too. Like 21 hp less with the SD than the DP4B at 3000 rpm. And average 9 hp less below 4500 rpm. My 383 car was a touch slower with the SD than a Performer on a mild ( high 12s) application. Could feel the difference cruising around town too.. Finally, even on my 500 motor dyno testing 3 intakes, the SD was noticably weaker below 4000 than the two dual planes tested. That surprised me on a 500 in motor.
