If no one else is going to speculate, I'll stick my neck out. IF (big IF) I were looking for a head, and really really wanted it, I would probably be thinking in the 1 to 1-1/2 range. Course, I'm not looking, and probably would be looking elsewhere, like for new, aftermarket, hot-rod-type heads. So, any opinion from here is worthless. I'd suggest you might try this question on the banger guys. My opinion is based on what I have seen for other banger heads, more specifically a Ford 4 cylinder used in another make vehicle.