Went and bought a K&N filter

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Just had same prob. with my 64 valiant adding one to an edelbrock base and top. They
are tight brand new and freshly oiled on non k & n bases and tops. Let it sit outside in sun for a few hours to draw her up a little and try again. Squeeze if necessary as they do have some play n them.

Oldschoolcuda
 
Keep tightening the nut on the top, as you tighten keep pushing in the sides and it'll eventually just pop in. I had the same issue
 
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