Okay another random Willys question that came to mind today. I searched the forum and didn't find anything.

So I know there was a high altitude head for the F134 that had higher compression. How, or is there a way to tell if it is from the outside? Between my two hurricane motors I was wondering if one might have the high altitude. And if there were any markings on the head to tell.

Thank you, just a geek trying to learn stuff that school doesn't teach!