You might want to do a search on oil filter, full flow, etc. There are few terms that can be confusing. Here's a start on definitions:
low-pressure internal oil lubrication system - used on all pre-1954 216/235 Chevrolet truck engines
high-pressure internal oil lubrication system - used on all 1954-1962 Chevrolet 235/261 truck engines (and on all 228/248/270/302 GMC engines).
by-pass oil filtration system - optional canister oil filtration system available for all 216/235 truck engines and 1954-57 261 truck engines (and all the GMC truck engines). In a by-pass system, only a small % of the flow of oil is filtered as the oil flows through the lubrication system. Think of it as a line that splits into two lines and one side flows through a filter and the other side goes back into the oil system. The side that is filtered also goes back into the oil system.
full-flow canister oil filtration system - a GM canister-based system for 1958-1962 261 truck engines. The oil flows through filter as if the filter is a "line" in the oil system.
full-flow spin-on oil filtration system - the oil flows through filter as if the filter is a "line" in the oil system. Now it gets more confusing:
1. This is an easy adaptation for 58-62 261 truck engines (that already have full flow filtration).
2. Supposedly, this is a possible adaptation on all other engines, as long as you use a restrictor washer in the inflow line (thus, it is still a by-pass system).
3. This can be used on any 216/235/262(54-57) (and any of the GMC blocks) that has been adapted (through drilling for a fitting, and plugging an existing internal oil journal) to work as a full-flow, spin-on oil filtration system. There are tech tips for this, I think.
This is most like too much information (and, if any of it is wrong or unclear, maybe someone will help out).
Finally, some of the above information needs to be slightly adjusted in reference to USA and Canadian passenger car versions of some of these engines.
Tim
