Is the full-flow oil filtration system only found on the 1958-1962 261 truck engine? Is a bypass-flow oil filtration system found on the 1954-1957 261 truck engines (as it was on the Canadian Pontiac 261 engines)?

http://www.oldchevytrucks.com/cgi-bin/htmlos.cgi/0075.2.3940963852016169258

Tim