http://www.inliners.org/tech/images/engine3_web.jpgOil Filters: If you have a late 261 with the ½" pipe thread holes on the left side, great! These engines have a full pressure full flow oil filter system. What that means is that 100% of the oil from the pump goes through the filter before it enters the engine. Maybe! Over the lower hole, you will see a boss with a dowel in the middle. If the dowel is out flush with the block, there will be a passage opened between the oil pump outlet and the main oil galley. If the dowel has been pushed in, all the oil has to go through the filter first. I don’t think I would try to move the dowel either in, or out. I would be afraid of breaking the block.
Hmm where have I heard this before? LOL! So mine is pretty darn flush with the outside of the block, yet it looks exactly like the one in the picture. Does that mean my nice spin-on external filter will only get a sampling? I have already tested and it gets nice oil flow to the rockers.
I added that to the How-To so it's there now. Sort of important don't you think? Yet it's nowhere in the shop manual for that engine!
