Lifter Valley Baffle Question

You can buy phenolic in sheets. I'm not sure if there are different kinds, but the sheet I used is glass reinforced sheet. Has high thermal resistance and high wear resistance. I got it from a friend that works at a company that uses it for sliding bearing surface. I use sealer under and on top at the front and back china walls. It doesnt seal under the intake ports. My heat cross over has been milled off the bottom of the intake and I can't remember if it was still there it would hit the plate. I didn't want to completely seal it. The air in the space would heat and expand maybe cause issues. One real benefit no more blown out cork gaskets. It never leaks front or back.