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Thinking about it dynamically you would think lower lift should be tested at lower pressure because the piston is not moving very fast or forcefully compared to 1/3 to 1/2 way down the bore when the valve is open and piston speed is high. Also if the ex valve is open it is just scavenging depression causing the flow witch surely is not 36 inches.

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I disagree, low lift is when it is moving the fastest during the overlap period and right after the exhaust valve closes, after that