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Moving up on the engine, we find these AFR aluminum cylinder heads. They are equipped with huge 2.08-inch stainless steel intake valves and use 1.60-inch stainless steel exhaust valves along with high-quality studs, guideplates, springs, and retainers. The runner volume on the heads is 205 cc, while the combustion chamber volume is 60 cc. The intake and exhaust ports as well as the combustion chamber are fully CNC ported for maximum flow.