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The A10 or later 510 is a 510 in name only. It was an attempt to capitilize on the former '68-'73 PL510s fame and racing history. From mid '78 through '79 in the US it was powered by the L20B but switched to the Z20S for '80-'81. Canada kept the L20B through '80 and switched in '81 to the Z20S. All A10s are carbureted motors. '80 Z20S motors had single plugs per cylinder and switched to dual plugs in '81. All Canadian Z20S had single plugs.Edit
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