Hello again. Haven't posted in awhile. My 67 Galaxie has a 67 S-Code intake on it with a 67 Mustang GT 390 air cleaner (non-california emissions). I was wondering if anybody has any insight as to why the part/casting number on the intake has no "9". Next to the large S it reads C6AE 425 G. Everything I've read has a "9425" I looked really closely at the casting and it hasn't been ground off. It's just not there. Was it a casting error or fluke? Thanks for any thoughts.