Are the tube nuts the same length as the original? I would think that as long as the bell of the tube matches the raised seat in the port and the nut is able to pinch them tight before you run out of thread, it should be sealed.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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