TR3driver
Great Pumpkin - R.I.P
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FWIW, I believe the original line was steel, at least on the earlier cars.
Copper works fine though, as long as you support it to prevent vibration.
I don't think the inside diameter has any effect on engine performance; actually the entire vacuum advance mechanism has only a very small effect on performance. And that effect is mostly to reduce fuel consumption under cruise conditions.
But joining the ends of larger tubing might be a bit more of a problem.
Copper works fine though, as long as you support it to prevent vibration.
I don't think the inside diameter has any effect on engine performance; actually the entire vacuum advance mechanism has only a very small effect on performance. And that effect is mostly to reduce fuel consumption under cruise conditions.
But joining the ends of larger tubing might be a bit more of a problem.
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smilie in place of the real @
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