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@hat_man stock tachs are often reporting high, say by 300rpm at redline. Being your discrepancy between 1900 rpm expected but tach showing 2,000 rpm, that overreporting could be the explanation
If you really do have 3.73, don't waste your life swapping to 3.55
I'd focus on other areas to gain FE, like aero, such as an air dam
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