240z aluminum brake drums for tr6s

[Peter Zaborski <peterz@merak.com>]

This topic comes up occasionally on the list, namely that the brake drums
from the early 240Z were made partly of aluminum and are a pretty reasonable
fit on a TR6 <http://www.grmotorsports.com/boneyard.html>. Does anyone know
how to tell if a drum off a junked car is actually aluminum or all cast
iron? I would like to do this at the junk yard so keep in mind I won't have
every tool from the garage with me. Is a magnet adequate? (ie. it clings to
cast iron but not to aluminum, right?).

Thanks for any suggestions.

Peter Zaborski  CF58310UO