hey guys,
this might be a rediculous question, but on the head of my 1958 235, when looking from the front of the engine if you look at the upper right side of the head there is a hole, on top of the head, outside of the valve cover. Its fairly large, about 3/4" or so. WHAT GOES HERE?! i've been looking at pictures at it seems like its a sensor of some sort. I can't find anything in my manual, nothing online, and i cant remember wtf i took out of there! I probably left it in and the machine shop took it out. please let me know what it is.
