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Edelbrock Oldsmobile exhaust crossover plugs (pair, PN 2733) are cast iron or steel replacement plugs furnished with Performer 455 manifolds and must be installed in the exhaust crossover port of each head. These plugs protect the manifold from cracking caused by extreme exhaust heat during extended wide-open-throttle use; finish and fit the plugs until they are a light drive fit for proper sealing.
Edelbrock Olds Heater Plug 1Pr
