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Vector1,
If you have the standard JBL headers and sidepipes they are:
Primaries:
3rd Harmonic = 31.6 inches long 1.75 Dia.
Collector:
3rd Harmonic = 33.6 inches long 3 inch Dia.
This was the best compromise that I could provide for the various 351 derivatives.
They are pretty close to your program numbers.
But of course not optimal.
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