original vs "NOS" Z/28 oil pans
 

I seem to be somewhat challenged technologically speaking, and have a really difficult time getting pics to post on this site, so I will just link the the comparison that I did over at team camaro:

http://www.camaros.net/forums/showthread.php?t=178450

No doubt some of you will have additional info, so feel free to supplement.

Re: original vs "NOS" Z/28 oil pans
 

The over the counter ones require the "fatter" gasket, for 1975 or 1976 and newer oil pans. The original ones use the "thinner" gasket. I just went thru this education process the hard way, had to drop the pan twice before I figured it out. The forward end is a little taller on the over the counter, later pans. They have different part numbers also.

Re: original vs "NOS" Z/28 oil pans
 

The one currently available is part number 360450. I believe the only difference between that one and the part number of, say five years ago (have it at home) is that one was spray painted, the other dipped. I have compared those two pans and could find no other difference.