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My original canister looks exactly the same, with tubing looking the same, running behind the oil filler neck. West, your canister has the button the bottom which leads me to believe it has the inlet at bottom, and runs from inside filter to outside also. So, if ours is factory correct, do we keep them as is. Again, perhaps machining out all fitting flows,and enlarging the hole, or holes in the inside canister pipe? If we do the second bypass line, will any oil go through the filter?
We are getting off the spring matter, but this could be very important to earlier 356's. When someone gets a fresh engine, might they learn from our mistakes, or factory mistakes.
Thanks again to all

Can you folks see the images I posted a few days ago? I get the black x if I click on them. Weird.

Rich

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The plumbing mod is detailed in that service letter I linked in tolandis original posts about the noisy lifter issue but after the mod, the filter drains directly into the pan. The first design prewar engines like yours with the full filter flow to the lifters did not have the drain hole so instructions were given on how and where to drill one. Basically it was in the block directly below the fill tube.. Later engines and not sure exactly when they made the change had the return port cast into the block lower down in the area where the oil pan bolts thread into.

Here's a photo of a spare 356 engine from 1946 that I just obtained. I believe it shows the areas in which you discuss. Are my arrows pointing to the right places?

Mr. Landis, I don't think I will be doing the oil line modifications to my engine.

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Yes, but they are pretty small photos and it's hard to see what's where.

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I can see the small photos in the post but when I click to make them larger to try for detail all I get is a blank window with a small icon at top left. Did you post directly to the site via the choose and attach file buttons or did you link to a photo hosting site.

I did what I always do, use a link from SmugMug. Weird.

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In the photo, top arrow is the feed to lifter gallery, middle arrow is the supply from pump and main gallery and bottom arrow is the added factory supplied return port.

Here is one of the later articles showing the plumbing mod and location of newly drilled hole below the fill tube. The earlier one they referenced had the instructions.

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I used a different linking method. I don't like the way I had to do that but you can now see the spring and big pictures.

Scratch the above. I figured it out. It didn't like the space in the name. You should be able to see the pics with a click.

See spring top right:



See spring at cross member:



I sincerely apologize for the hi jack but it was driving me crazy.

Rich

West, I can click on your engine photo and enlarge it with no problems. Curious about the fittings and tubing as pointed to on the bottom arrow. This is the drain line, but can't figure out what the plumbing arrangement is all about.

(o{}o)