Guys, I need your help.

I know this Harrison radiator reproduction tag is for a '70 442 and not a '70 Chevelle, but I have found that all of the knowledgable people seems to be right here on Team Chevelle!!!:hurray:

I know that "IF" and "CI" are the radiator side tank codes.

I also know that "EC" is the radiator assembly code, found in both GM assembly manual and also the build sheet code.

But, what does the "74" mean???


http://i764.photobucket.com/albums/xx285/ROCKET-VAPOR/70442RADIATORTAG.jpg