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Smokey Yunick modified his Daytona car when he found that the under hood pressure was making the fuel injection system go super rich. He added two relief flaps in the floorboards that allowed the high pressure air to escape the engine compartment.
Good for an additional 20 MPH on the Daytona Beach qualifying. Qualifying in 1957 was a max speed run down the beach with the fastest car getting pole position.
This was before fuel injection was illegal.
regards
Mech
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