There isn't a difference...the point is that with a LS6 there is a point of reference as far as documentation if the car has a buildsheet...With a COPO there isn't that point of reference..therefore it would be quite a bit easier to fake one and since the hobby says factory paperwork isn't needed to "validate" the car it would "pass" the muster if done correctly. Try to get the same value on a LS6...won't happen since the hobby expects at a minimum a buildsheet...Also while BE rears are hard to come by they aren't impossible and since that is one of the "key" COPO components people are even restamping them...


Jeff..I never changed my opinion on the values..I think the "acceptable" paperwork on a LS6 (the buildsheet at a minimum) means that when looking at both cars of equal condition and validated as to what is acceptable (a buildsheet for the LS6, nothing but a build date range, a BE rear, and a body sequence range for the COPO) the LS6 im muy opinion should bring more money, as it has factory docs and would stand a greater chance of being legit. Case in point is this L89 '69 Chevelle convert that is local. If that car had a buildsheet with it's original drivetrain it would be what 200k frame off restored..much rarer than Yenkos or LS6 converts..Since it doesn't have the "acceptable" level of docs it is only worth 75k or so done...Why?? Because the guy having the income to buy wants to see he is buying the real deal....not saying "well...??"