The AIM says to use #6410203. However, I can only find #6410206. Are they the same cap?
67 Expansion Tank Cap
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Re: 67 Expansion Tank Cap
George-----
GM #6410203 was a PRODUCTION-only part number. GM #6410206 is one of the SERVICE equivalents. However, not all of these are the same. Earlier versions use a zinc plated steel sheel with large "ears". This is the style used in PRODUCTION and available in SERVICE in the early years. The versions available under the 6410206 part number for the last 20 years, or so, have a stainless steel shell with small ears (to discourage folks removing them while the engine is hot).
The 6410203 and 6410206 are both RC-26. Reproductions are available for this cap in the PRODUCTION configuration.In Appreciation of John Hinckley- Top
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