I am going to attempt to change my headgasket this weekend. I was planning on having my head milled to increase my compression up to around 11.0:1 what is a safe amount to mill the head? its a stock gsr bottom end running skunk stage 2's. Also what other gaskets should i replace. I mean which ones can i more then likely reuse and which ones am i better of replacing. Also do i need to get a new timing belt tensioner or can i reuse the one i have. its pretty new. only a couple thousand miles on it. any help would be awesome. Thanks.

 

Safe is .03" off, which will require about 2.5 degree's of advance

With milling you can hit 10.7:1

 

so three thousanths would be alright... what would give me 11.0:1 compression with a stock gsr bottom end? and what gaskets should i replace..

 

You could look into getting flat top valves.

Cam seal gaskets wouldn't be a bad idea.