There have been several threads on this.
Hi John
If I'm not mistaken there have been several good discussions of 216/235/261 oil filter issues in the past. Which someone will I'm sure post links to shortly.
I've just finished rebuilding both a 235 and 261 and the oil pump and filter piping is an issue. It is possible to convert a 235 which is a partial filter system to a full flow filter system, a conversion that if you are doing a complete rebuild you might want to consider. I did my 235 and it seems to work good.
I'm working on a page for my website about rebuilding these engines an the oil systems which I will try and finish up and get posted soon.
The Hammond Barn thread shows what they have been upto on this issue.
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