48321
Replacing the 389 and 421 V8s of previous years were new 400 and 428 cubic-inch V8s with bigger valves and a valve angle change built off the same Pontiac V8 design in use since 1955 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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