A Canadian delivered LS6 would be US built but info available from GM Canada Vintage services like other Canadian or U.S. built vehicles sold new in Canada..
Canadian info gets faked just like PHS does so sending for your own always best and cheap too!.
When considering Canadian delivered cars, after confiming the GM Vintage paperwork it's best to take a step back and reconsider all as rebody/air cars are more concerning than the fake paper game..
We've looked at a few examples here in the past where waving legit GM Vintage paperwork around seems to have sucessfully distracted reality and some of the cars still questionable?.
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~ Pete
GM Canada Vintage links...
http://www.vintagevehicleservices.co...tion_73.45.pdf
http://www.vintagevehicleservices.com/options.html