RB VS B Blocks

stolen from www.allpar.com

The 383 cubic inch RB engine was only available in 1959-1960 on the US built Chrysler Windsor and Saratoga (thanks, Ian Smale and Bill Watson); at that time, American-made Chrysler and Imperial cars used the RB blocks, with the 413 going into Imperial, New Yorker, 300E, and 300F.