Mine 389 does the same thing but only when the engine gets over about 2500 rpm.. Weird.. I thought it must be vibration. I'll try to turn it around and see if that works. I know the lower tube is in because I put it in and the PVC valve is good.
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1965 GTO Hardtop - Fontaine Blue, Blue interior, 389 Tri-Power, 4 speed, 3.36 posi, Rally I's
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