My July 1955 Corvette Parts Catalog lists GM # 850778 (in Gr. 1.203) as the part number for the 53-55 (exc. V8) radiator cap and is described as "pressure type" and "chrome". Further research indicates it is a 4 PSI cap. I believe that it is an AC cap. Is this the only cap installed on the 53-55 assembly lines?
Pictured below is a NOS cap that I found at a swap meet last Sunday. It is stamped with the number "4" (4 PSI) and I believe that it is made by the Stant company. It is very similar to the 3708174 cap (7 PSI) shown in Noland Adam's 53-62 restoration book (57 Corvette) on page 150 except for the pressure rating number.
Dave
Pictured below is a NOS cap that I found at a swap meet last Sunday. It is stamped with the number "4" (4 PSI) and I believe that it is made by the Stant company. It is very similar to the 3708174 cap (7 PSI) shown in Noland Adam's 53-62 restoration book (57 Corvette) on page 150 except for the pressure rating number.
Dave

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