To settle a debate I started several months ago:

Yes, the aluminum engine block can be safely welded, providing the welder
knows what he or she is doing. A Heliarc welder and Alloy #5356 are what's
needed. Info source is a highly reputable (primarily VW aircooled) engine
rebuilder in Seattle, who welded shut some holes in my case.

Steve
Calvin, the 84 Westy

Steve Sullivan
Off the Map Consulting
1326 S. 13th St.
Mount Vernon, WA 98274
360-428-7018
steveis@speakeasy.org