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Restrictor plates are used to slow down the race cars at superspeedways like Daytona and Talladega. It works by restricting airflow through the engine. It is placed ...
between the carburetor and the intake manifold
between the cylinder heads and the engine block
between the air cleaner and the carburetor
between the block and the exhaust system
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1970s
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Heavy budget cutbacks forced NASA to develop the . . . in the 1970s.