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The real difference is in the rear seals, the 519 block uses the neoprene seal while the earlier blocks used the rope seal. The parts listings always indicate a '59 model year as the breakpoint where early cars were rope and later cars were neoprene.
The real difference is in the rear seals, the 519 block uses the neoprene seal while the earlier blocks used the rope seal. The parts listings always indicate a '59 model year as the breakpoint where early cars were rope and later cars were neoprene.
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