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Our search for more steam brings about a cylinder-head upgrade that we feel will pay big dividends on the dyno. These are the new AFR 225cc castings that we're counting on for next-level performance, as we've taken notice of how well they perform on the NMRA Renegade Mustangs that T-top coupe's powerplant is somewhat patterned after. The heads feature lightweight 2.08 (intake)/1.60 (exhaust) valves and have a combustion-chamber volume of 72cc (the 205s have 58cc chambers). The deck on these heads is 3/4-inch thick, which is perfect for the heavy amount of boost the engine will see as we continue working with T-top coupe.