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What is the Truck's VIN? We also need the engine casting codes and the "stamped-in" date code, found on the block by the starter and the water pump, respectively. Post it back and we'll take a look.
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Actually, neither preceded the other. Both introduced in 1965. The 240 was the standard engine as Barry indicated, 300 was an option. The 240 was discontinued in 1972 in favor of the more popular 300.
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