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After disassembling the heads, the first thing Peart did was degrease the castings. These are 2843675 castings with 1.78/1.50-inch valves that use rocker shafts instead of individual studs. The center two exhaust ports are siamesed and employ an odd dogleg design that can best be described as weak. The intake ports measure a small 119 cc, while the chamber measures 68 cc.