Lifter Valley Baffle Question

are you trying to keep hot oil off the intake? This is what I did 1/8" thick phenolic plate. Sits on the end valley walls. Glue it with sealer. Takes the place if cork end seals

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Well that's different. Never seen that before. Yes just trying to keep the hot oil off the intake. What do you mean by phenolic.
Can you explain what that material is in more detail ?