I WANTED a similair arrangement as You with two caps. Unfortunately the neck of my swirl cracked (just as they were loading it to bring back)
the quick fix was to put a dome end on top of the swirl. I now can greatly see the advantage to have the swirl as a place to fill.
My right side engine cover had a hole cut and the expansion tank raised to where the cap is flush. My plan was to open expaision and fill at swirl to full, leaving the space in expansion tank for expansion.
I've had several events in the past week on my returned pantera, I am now "searching " for the expansion tank level where I just "pee" at full expansion.
Using a wooden "dip stick" i think i now have expansion level cold at top of my domed swirl. Possible plan is to put a nice screw in plug, (or just leave as is)
Here is the drawing for the instructions I provided shop
I have attached the entire instruction and MY reasoning for the modifications. the shop was instructed that verbatom was not need, just the intent. they did an excellent job and I will get some photos of thrier work soon
