How to clean carbon?

[Spare_Parts]

Oh and get a new head gasket, you broke the seal on the old one so it is formally toast now.

Sometimes you can flip the aluminum gaskets over and get it to seal but it doesn't always work.

 

[Frankenstein]

Sometimes you can flip the aluminum gaskets over and get it to seal but it doesn't always work.

You'd be just as likely to succeed by not flipping it over, sometimes is good enough once in a while.