318 MAX fuel economy builds?

mpgmike said

Yes. It was a high compression engine (don't remember anymore the specs) and I retained the EGR function. FWIW, George Arlington Moore used EGR back in the 1920's to improve fuel economy and power, and reduce emissions (HC, CO, and visible smoke). He increased compression and advanced ignition timing.

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So if I take my Air-aid to my machinist and have him machine ports around the perimiter with dead ends drilled towards the center between the holes but not piercing them this may help MPG. Then cap the extra holes and run a coolant line through the spacer to keep the mixing fuel air warmer? I can get that done pretty easy if you think it would help.

I was thinking of welding the manifolds heat cross over closed and run coolant through that to keep that area cooler. Bad idea?

Also, What temp coolant did you pipe through the spacer? I assume you were very specific about that and tested different temps?