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The phenolic will do what it says, the trouble is that the intake itself is being heated by radiation/convection more so than through conduction. Given that there are still areas of high heat transfer from the block to the manifolds themselves (studs/bolts, etc). The trouble is aluminum has a wonderful heat transfer coefficient which will transport heat throughout the entire piece until a cooling agent has been applied. If you've already fixed the venting of hot air and convection currents, then I would purchase the gasket as a final step. Beyond that I highly doubt you'll see anything similar to what they claim.
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