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While the never ending battle of long-rod versus short-rod debates between mechanical engineers and Internet nerds continues to brew, Castillo took to his grinder and notched the lower skirts of the piston sleeve in order to make clearance for the newer, yet shorter H22a rod. The H-rod's length from center to center is 5.63" or 143 mm while the F20C rod is measured at a longer center to center length of 6.02" or 153 mm. Creating a shorter rod ratio causes an increase in rod angle which is highly debatable in terms of efficiency and "dwell" time. A few taps on the calculator show the F20C's factory rod ratio at 1.82:1 and the H22a calculated at 1.58:1.