the brake line was pre-bent, but it was also bent 180deg in the the middle so that it was only half as long to ship. i think you should use the aluminum cause it will be much easier to work with. i can't think of any reason why aluminum would be unacceptable.

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1984 300TD "MAX" 303K+ still going...
fast '70 Chevelle 200k+
home built Shovelhead chopper