Page Last Updated 05 June 2005
Special thanks to Bruce "Phat" Childs and The StoveBolt Page for a lot of the technical content in this article. Please visit their website often. Lots of great stuff over there!
This is all about how to install Full-Flow oiling on your 235 or 261 engine. In case you didn't know, the old canister filter assemblies mounted on the manifold only filter about 20% of the oil in your engine. They are inefficient, hard to keep clean, and filters are becoming harder to find. This How-To will change all of that!
On the later model 261s with the large 1/2" oil lines coming out of the block, you can skip down to the section on how to install the spin-on filter adapter assembly.
This is how I have done the full-pressure oil filter on the 235/261. I don't suggest you do this unless the motor is completely apart for a rebuild. With the drilling and tapping, there will be too many metal chips to do this on a motor that is already built.
All of the drilling and tapping will be done on the oil pump side of the block.
This is a better shot of it from a distance.
This will help give you an idea of how it's hooked up. Don't hook it up wrong. It could ruin your engine. The oil going OUT from the filter back into the engine again is the outlet on the block closer to the flywheel end.
The oil coming IN to the filter comes out of the forwardmost outlet on the block.
This shot is so you can see the outlet pipe and the connection that will be for the oil pressure gauge.
That's all, folks! The oil filter I used is Napa Gold Series Part #1515. It's readily available. Now you have all of your oil being filtered and an easy spin-on oil filter to do it!
