As mentioned I've gone through two of these on my 258 Jeep engine. The oil filler cap that the aluminum valve cover comes with is loose and leaks constantly so I tried that. It works for a while, but then the rubber breaks and becomes unusable. The first time I thought it was a defect so I bought another - now it's happened twice and I realize it's a poorly made product. Instead, I now use a Specter SPE-1738 Performance 1738 Chrome filler plug, which is very tight but hopefully works better.
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