[ohboy321]

Originally Posted by geezer#99

Road draft tube cap.
Used on the last 327's to hook an inline pcv to the carb.

Like in this diagram.
http://www.corvetteforum.com/forums/...pcv-valve.html

Thanks Geezer#99, I was a little concerned not knowing what it was for, but now that I know what it is, I will look into possibly hooking it up.

For reference, the numbers on the block decode to a 1966 GenI 5.3L 220HP 327.

Thanks again!