Can anyone tell me how thick the 400 emblem is supposed to be on the trunk? I am assuming it is similar to the 400 hood emblems which I believe is 1/8 inch. I just purchased a "OE style" emblem and are a little more than 1/4 inch and have a slight taper. The taper is less than the original 350 hood emblem.

Any help would be appreciated.

Your new one sounds right. My original is 1/4 on the bottom, tapering to about 5/16 on the top.

Thanks Jim. Mine is 3/16 on the bottom and tapering to a little more than 1/4 on top. So not exact but I think it will do.