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The new engines featured Heron combustions chambers, meaning that the heads were flat, and the combustion chamber was actually part of the piston, rather than being in the head, leading to bowl shaped tops to the pistons.
These pistons were contained within cast-iron liners which were inserted into the waterjacket with a rubber lip style head gasket, a departure from normal methods the liner is then inserted into a recessed cut-out in the head and sealed with compressable metal rings.