What size tool do you need to take the 1jz bolts out of the head. It looks like a twelve point something. It's ten millimeter I think. Where can I get one and what is it called. I'm doing the 1jz swap and decided to have my head reworked while the engine is out. Actually I was going to replace the head gasket and decided to have the head rebuilt. Just thought it was a good idea to do it right the first time. Any help would be appreciated........Thanks.