Radiator Cap 500 cu in. 1976

[Jeff Moffo]

Wondering if anyone can tell me if this radiator cap is what would have been OEM on my car back in '76?
Thanks,
Jeff M

[Dan LeBlanc]

To the untrained eye, that would appear to be an aftermarket replacement.  Do you have a more detailed close-up photo of the cap in question?

[Jeff Moffo]

Hi Dan,
Unfortunately, I do not.  I am really trying to ascertain what cap would have been on there on day 1...seems difficult to do.  I did try OPGI and their OEM cap looks entirely different.

[jsanford]

RC27 is the correct AC cap for '76, the one in Matt Garrett's picture looks pretty original. Here is a repro RC27 that looks the same as the one in Matt's picture: https://www.thepartsplaceinc.com/classiccarpartsdetail.aspx?partNumber=CS12460T&Year=1968,%201969,%201970,%201971,%201972&Model=Cutlass/442&Cat=Cooling%20Systems&Subcat=OVERFLOW%20BOTTLE%20KIT%20and%20COMPONENTS

Obviously it is not being sold as fitting a 1976 Cadillac, but it is the right cap number and it seems to match the original 38 year old one in the picture.

Jeremy

[Jeff Moffo]

Wow. Thanks. My previous 76 Coupe had an original style(or so I was told)  shown in the Eldorado's 500 in that cutout photo. I appreciate the link, Jeremy.
Regards,
Jeff

[mgbeda]

Great find, Jeremy!  I want one.

I had gotten a new Delco RC27, but they are black and yellow now.

I have had some luck with Oldsmobile 442 parts suppliers too.  USA parts sold me some repro two-wire-and-screw type radiator hose clamps that fit perfectly, but were only listed for Oldsmobiles (they may be changing that now).

-mB

[Jeff Moffo]

So the red stripe is day one from the factory, correct?

[jsanford]

I think the "Red Stripe" cap is correct back to 1969, the first year of the closed system.

Jeremy