I made spacers to isolate the bottom plate from cam oil and it helped just a little like 10*, I think the hot water passage shareing a big aluminum wall with the intake air helps heat it a lot also, between the two its just an oven in there. Thats not even to mention the giant plenum means the air spends longer inside getting heated up before goinig in a runner.

I am not causing global warming, I am just trying to hold off a impending Ice Age!