I have proform valve covers and a proform chrome style oil fill cap. Has worked fine all last year, but noticed this year it is loose. I found it spun around where the word "oil" imprinted on it was sideways. It is now very easy to turn it, whereas when new last year it was very tight.

It also has some movement in it now where I can slightly lift it off the valve cover a bit (think pushing/pulling to vc face). I think this could be affecting my vacuum leak issue. Not to mention the little bit of oil found around the base of the cap on the valve cover.

I found on the forced induction section of the forum that there is a newer cap style that is supposedly better. But every picture I find of it just shows the black crinkle face and not the seal. Part no. is 141-629. Does anyone have this and can show me what the seal side looks like, or compare to my pictures below of the one I have now. Any other recommendations on a better sealing and reliable long lasting cap for these covers?

Car is N/A with simple bolt ons. No heads, cam, blower. Wanted these for the look, and do not want to weld and repowdercoat anything just so you know in advance.

 

you should replace that cap sap, it will start leaking. mine did and discolored my header and driped on the floor of my garage. I didn't realize what was leaking until it made the mess, thought it was a cracked header tube. I am wondering if anyone has a solution also. Proform sent me a replacement cap free, hope it doesn't happen again.

 

I just contacted proform asking if this was common and their recommended fix. I'll update the post when they respond.

 

That design doesn't look like it uses an o-ring for sealing like the factory cap.

 

It doesn't, but now that you say It I wonder if I can use the o-ring from the factory cap to put into the channel of this one. Or just get myself an o-ring to fit this...

At my lunch break today, I ran to Advance Auto Parts and they had the other press in part number on the shelf. Was going to just grab one for the heck of it, but I noticed it did not have the flared end to it at all. I felt like that would be even worse. At least mine will stay in because of the flared end to create the channel as I call it. If the new one were to fail in the same way, I'd for sure lose the cap and have oil spraying everywhere.