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1976 911S whooshing sound trombone oil cooler

Engine

Vehicle Information: Model: 911S; Year: 1976; Body Type: Coupe; Total Mileage: 233,000;

I replaced my 2.7 motor with a rebuilt 3.0 and added a trombone oil cooler at that time. Since having made this change I hear a whooshing sound on the passenger side, the sound pretty much goes away after the engine has warmed up. Is this normal, if not ideas on cause and resolution.

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