I may be missing a post, so I apologize for asking..... But what is you end game? Head gaskets? Valve cover gaskets? I am not the greatest mechanic and I Took both heads off. Just write things down, be methodical. This cover bolt is a pain, but it's doable. I will look thru my pics to jog my memory, but it seems that a universal was used in there just to break it loose, then the brake booster got in the way, so then used old fashioned hex, then by hand. Again, I don't know wether to encourage you to press on cAuse you're almost finished, or to prepare you for more wrenching!