Steve, extruded ali will crack when you try and bend it. (don't ask how I know
) It is a much higher tensile strength than "sheet" ali due to "extrusion" process. It might work if you anneal it first.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG