Straighter Scoop
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The '70 1/2-72 Trans Ams and '74 GTO were among the few GM applications that specified the AC/Delco A366C air filter. With an outside diameter of 13 inches, this filter was shorter in overall height to accommodate the reduced clearances under the shaker scoop. With limited availability, many owners elect to replace the A366C with K&N filter number 1590, which provides the same overall dimensions and is reusable. View Related Article
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