Just to eliminate any possible confusion...Any Canadian 261s I've ever seen (admittedly few, all in the Parisienne sedans) didn't have the full flow oil filters. They came with the bypass setup, like the pre-'58 US 261s...so they have the smaller oil line fittings. Another difference is that they had hydraulic lifters.
If anyone knows different, please post. Maybe full-flow filtration came later.
