[69chevy]

Thanks MR70 for the info. I never paid much attention to the numbers thing in the past but whene my buddy had things in different areas it peaked my interest to find out how GM did things and if there were any consistencies. What i have learned from this site as well as others on similar topics is there is no rhym or reason to it. I think the Calif. plant was the only plant to stamp stricktly on the upper pad.