Hello,
Got a question that I can't find the answer for. My 04 XG350L ran hot and warped the heads. I had the machine shop deck both heads since they were bad. The shop said there is no decking spec's so it might not be save using the factory thickness head gaskets. Does anyone know if there is a head surfacing spec out there? I notice Rock Auto sells head gasket shims to compensate for decking. Can't find any info on the web about resurfacing the 3.5l heads. Help.

Any inputs?
Thanks