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DavidG · 08-10-2022, 11:53 PM

With respect, all '32-'34 cups were one-piece steel stampings. 48-4520-A1 and 48-4520-A2 are the two versions of the two-piece caps released for the '35 model year. The cast version (not forged) has the part number cast in on one half. When a part number has a number following its letter suffix, that indicates a different supplier and normally a different design with the same functionality and therefore the same basic part number. It is one of the telltales of the Ford part numbering system that has remained more or less unchanged in terms of its basics for 98 years.

It could a regional thing as I've never thought of the cast ones as particularly uncommon.

08-10-2022, 11:53 PM	#5
DavidG Senior Member Join Date: May 2010 Location: southeastern Michigan Posts: 10,101	Re: Cast vs. stamped steel clam shells With respect, all '32-'34 cups were one-piece steel stampings. 48-4520-A1 and 48-4520-A2 are the two versions of the two-piece caps released for the '35 model year. The cast version (not forged) has the part number cast in on one half. When a part number has a number following its letter suffix, that indicates a different supplier and normally a different design with the same functionality and therefore the same basic part number. It is one of the telltales of the Ford part numbering system that has remained more or less unchanged in terms of its basics for 98 years. It could a regional thing as I've never thought of the cast ones as particularly uncommon.