Wanna hear something confusing? The 402, as optioned in Chevelles that were not SSs, was called the 400. So there was a 402 that was marketed as a 396 AND a 400 (and, no, not to be confused with the 400 SBC)!

I bought a 71 Impala for the drivetrain and it had 400 badges. I never opened the hood until I got it home. I bought it dirt cheap. When I opened the hood I realized it was a big block 402. What a nice surprise as I installed it in a 71 Malibu. It wasn't a race horse but it would lite the tires up at 30 mph when you mashed the pedal.