One of the issues with a small block intake is it is a wet intake. So it will get heat from the coolant in the front. Nothing you really can do about that. So this is what I did. My heat crossover has been machined off the bottom of my stock 340 intake, but I’m not sure that matters. If part of your intake sits lower than the front or rear china walls you would need to modify this a bit. So I got a sheet of phenolic material. It has to be thinner than the air space where the cork end gaskets go. My piece is thicker, so I just machined the ends a to the right thickness. I just rtv the china walls and place it on the walls. A bit more rtv on the top on the ends and the intake goes on. No more oil leaks on the ends as an added benefit.
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