Okay so I have the head off my project Engine and being a guy I wanted to see what the new head looks like on the jug. This rands head won’t go on it just doesn’t fit? The air cooled head falls right on. The stud holes are smaller on the Rand head. Am I missing something here. I’m confused?

I've installed MANY Rands heads. I open the stud holes up to the next size on each one. Still fits just right.

That’s what I was thinking didn’t want to do that with out asking first! Thank you!