Replacing transmission lines

RedFish said
There is a soft bendable tubing available in coils but it has to be made of some alloy, aluminum, lead, or who knows ?
the correct steel tubing is unforgiving. Bend it wrong or kink it and restrict flow, toss it and start over.

guessing zinc is in the OK list with aluminum, steel, lead, ect.

Thinking of going the bending route because there is no room to add a nice pair of headers

been there done that - on the last sentence:banghead: