We have a problem Houston. Seems that GM did things "Ford style" and there
ARE differences between sy and ty intercoolers:
The position of the filler neck is just over an inch closer to the engine on a sy vs. a ty. From the base of the filler neck to the right edge of the IC, it measures 1 3/16 of an inch on my "red headed step child" (sy IC) and 2 1/4 on my ty one. The distance from the front to the back of the filler neck is the same as is the locations of the inlet and outlet on the back. I was going to ship out my high visibility red one so that it didn't get lost so easily. I wouldn't *think* that I need to ship both but that has already gotten me in trouble once already. Rob please LMK if I need to ship both. Good thing that I have lots of parts laying around...
EDIT: It looks like this might have been a manufacturing oversight. The hole for the filler neck got installed referenced from the wrong side would be my guess (the distance from the edge is a mirror image). I wonder how many "reversed" filler neck intercoolers are out there... On my truck, the filler neck is like my spare red IC above. Anyone who wants to get a blanket will have to mention which side the filler neck favors on their truck.