Regarding the full-flow oil filter system on '58-'62 truck engines:
1. Was the full-flow oil filter system available on the 235 engine? I understand it was only available on the '58-'62 261 engine sold as on option on USA trucks (not the 261 in Canada).
2. It is my understanding that an oil filter was still an option on the '58-'62 261 truck engines. As I recall, when adding an oil filter to one of these engines, a bypass in the block had to be changed (it might have been mentioned in the 261 article posted above).
3. I was told (by Patrick's, after buying a beehive filter) that a canister-style oil filter could not be installed on a full-flow engine (I know for certain that one would not work on my 1960 261).
4. The '58-'62 261 block's holes for the oil filter lines are much larger diameter than the holes for the by-pass filter (1/2" NPT ? - approximately a 7/8" hole, as I recall). I will post a picture tonight or tomorrow.
Hope this is correct and that it helps eliminate some "possibilities".
Tim
