I'm currently trying to take the intake manifold off my h23, everything's disconnected but once i get to the nuts i found that 7/16 is too small, 1/2 is too big, 10mm is too small, 12 kinda works but strips the nuts so too big, i can't find an 11mm wrench anywhere but when i tried to put a 11mm socket on it just didn't want to work, kinda lost and this is really starting to **** me off

 

Its a 12 mm socket needed. Are you using a 6 pt socket, or something else? Might need a better socket to get these off right, and I would get new ones to replace them if you are rounding the heads off the nuts.

 

I managed to fit a 6 point 12mm socket onto one of the nuts and it still stripped it, this prelude's fought me every step of the way lmao