« Last post by Bryan302 on February 20, 2017, 04:50:17 AM »
Thanks Lynn, That is a very good comparison between the original and service replacements. That is a good reference showing the measurement for the thin or thick front seal.
One thing that I would like to bring up, but not to bring 67-68's in this. I saw in the 68 Z28 oil pan thread, post #10 (link in my first post above) that Jerry (1968 Z28) mentioned that he found in the 1969 parts manual that the 1969 pan was 3974251, vs. the P&A catalog stating it was 3961398. The 1969 parts manual also stated the pn# 3927134 was for BOTH 1967 and 1968 302. It has been determined by original survivor cars and known experts that 67 and 68 302 oil pans are definitely different!
I have always heard that GM did not change the part number unless the part actually changed in some form or fashion. So, If 67 and 68 302 pans are different, why or how are they the same part number? I suspect the same thing is going on with 69 with these two part numbers being listed for the 1969 302, 3974251 and 3961398.
I do realize that the only answer is going to come from an NOS example, or a close study among all part numbers and parts books. At least, I would like to find out if there were actually two production line 1969 302 oil pans, or a parts book FUBAR!