Re: Delco spirals...
Do not forget that GM spec'd the parts to the suppliers. So the spec included the assembly line codes. Many times the only difference between line parts and counter parts would be the packaging.
However there are examples of counter parts being flow coated vs phosphate as the paint held up better on the shelf. So unless GM specified otherwise why would the supplier differentiate.
There were many original counter parts with assembly line codes on them. Especially shocks. Once the original run was over the subsequent runs probably did not have the codes. Especially sticker codes.
Early 60's NOS shocks did not have stickers. But I have seen plenty of late 60's up through late 70's shocks with these stickers.
Stamped codes like pulleys would have been the same until the part was superseded.
Greg
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