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The Ford 200CI six was my first "efficiency" project in the 70's. You can mill the head sixty thousandths. Or, you can pick up and old 170CI six head, mill it 0.060 inches and install for even more compression.
I did this. I also added a Weber 2bbl progressive carb, with small primary and larger secondary venturi. I milled off the single carb mount and brazed on a rectangular steel mount for the Weber. I fabricated all of this in a few hours. It could be done with a sawsall, a die grinder and a disc grinder.
I added a later model electronic ign, with vacuum and centrifugal advance. I think it was a Ford EecII.
I also did exhaust work, headers, transmission change etc.
I went from 21MPG or so, to 32.
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