Yeah, since Ford intro’d in ‘54, GM in ‘55
The V8 OHV Ford engine that debuted in ‘54 was the so called Y block. (239, 272, 292, 312) It had a flat oil pan rail that resulted in a heavy block,much like the FE series (’58-76) BBF’s. (352, 360, 390, 427, 428). The SBF’s (260, 289, 302, 351W) pan have concave areas where the crankshaft goes and is much like the SBC’s block design.