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Let me add at this point that I have run many model a engines with high compression heads (flatheads and overheads) over the past 50 plus years. The car I am working on now has had a 7:1 Winfield for 11 years. I have no worry about high compression. I asked about a 6:1 or less compression ratio as I was curious to see if it might reduce oil consumption in my weakening engine.