Original 53-55 six cylinder expansion tank cap?

[Troy P.]

Per the Technical Information manual I am aware that the 778 cap has three different configurations as to the placement of the 778 and 4#. But I'm curious about the two caps in the photos since one has patent numbers on it and the other does not. Both photos were taken on very low mileage 54s.Yager 54 194.jpgHall 54 200.jpg

What do you think?

Please post photos of any six cylinder chrome expansion tank caps you are certain are original and a photo of a known repro would be nice for comparison. (Speaking of which, does someone still make the repros?)

Also I have only seen one car with an original chrome valve cover. I'm interested in finding out if the oil filler cap on the chrome covers was the same as used on the painted covers but chrome plated. For some reason I think they may not be the same caps. So any photos of those would be appreciated.

[Chris S.]

Re: Original 53-55 six cylinder expansion tank cap?

Troy
I have an original tank cap on #3803 - I will take a photo for you - I have not seen a 4 lb repro.....
I have seen other 4 lb caps but they are not the same
My car had an original chrome valve cover - i have a photo of the engine compartment from the second owner.
I will send you photos of my fill cap
I agree - I dont think the fill cap was the same.

[Troy P.]

Re: Original 53-55 six cylinder expansion tank cap?

Here is another original cap from the lowest mileage 53 known to exist.
Miller 53 309.jpg