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Originally Posted by weim55
Found this over at the GM heritage site. Still couldn’t find any information as to the actual differences but this does show the LS8 as a heavy duty version of the standard 350. $27 more for the option over the standard 350 as well. Hmmmm.....
Steve weim55 Colorado
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Found a little literature for '69, LS 8 was the engine used in C 40 C 50's. SPID shows MD ( medium duty) , GM option list shows HD ( heavy duty ). Literature lists Medium Duty. 2 against 1, same engine, so 350 medium duty it is! The only heavy duty Chevy V8's I'm aware of are the tall deck 366 and 427's.