The 1954-1957 261 engines were plumbed for use of an optional by-pass oil filter (as used on 235s and 216s).
In case someone asks, the 261 Canadian Pontiac engine used a by-pass oil filter (it never used the full-flow oil filter) and it had hydraulic lifters (I do not know the years this was available).
The 1954 optional 261 Canadian Chevrolet/GMC truck engine was like the 1954 261 USA Chevrolet truck engine. Does anyone know the years in which this engine was available in Canadian trucks?
