ac rc26 #15 radiator cap gm part #?

[Dennis C.]

Does anyone know what is the gm part number of this cap? It does have the aluminum center rivet . The group # for radiator caps is GR 1.203. What would be the application. I know the early big block caps had the large ear configuration. I think the small ear caps were produced after 1973.
Thanks Dennis.

[Larry M.]

The aluminum rivet RC-26 cap was used for the small block cars with Harrison aluminum radiators. The big block cars with brass radiator used the RC-15 cap which had a brass rivet.

All the C2 cars had caps with large ears. Small ears were somewhere in the later C3 era I believe.

I will post part number in a few minutes.

Larry

EDIT: One of the part numbers is #6410206. I am sure they changed over time. https://www.ebay.com/itm/383506577027?_skw=AC+rc-26+radiator+cap&itmmeta=01K3EWXCF0PA2YWFP5CCFRA05F &hash=item594ac5f683:g:fHoAAOSwNC5eekis&itmprp= enc %3AAQAKAAAA0FkggFvd1GGDu0w3yXCmi1fnP%2BG0naBgMhC19 vbg6A9%2F5P3lMfitUsCW4c%2FXyJLM4pdeZrqdxIrc5jmb32S DpoCVzAZpq2QBWgKc1A7d9KQmpn%2FG%2BIrrfiZuOCWfKQz%2 BRR1UnZCWQmFW%2Bo%2B0pDMhMOLQX%2Bf3FxI81IkWKjf5exz vWesYlT8lpE6chqQ%2Fxh8a49T6apT%2F5A2mWFqt88sug1aWa tOGPYFoZ4ojX4ft1%2FlcJUUKAHhaXcUgfOKaZa9XspGB%2Fd0 6X9%2BJJhczOILPj%2Fo%3D%7Ctkp%3ABk9SR9rH9dybZg&pfm =1

[Joe L.]

Does anyone know what is the gm part number of this cap? It does have the aluminum center rivet . The group # for radiator caps is GR 1.203. What would be the application. I know the early big block caps had the large ear configuration. I think the small ear caps were produced after 1973.
Thanks Dennis.

Dennis-----

The GM part number of this cap was 6410206

[Dennis C.]

Thank you Joe and Larry for the part number information.
Dennis