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1978 911SC Air Box Pop Off Valve

Engine

Vehicle Information: Model: SC coupe; Year: 1978; Body Type: Coupe; Total Mileage: 178,000;

I recently acquired this car and am just learning about the brand. I needto know if a pop off valve is required. In the air box where all theinstructions say to install the valve there already exists a 2 1/2 "metal topped instrument. It doesn't look like a pop valve illustrated.Engine number is 6382811.

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