We've discussed the CE engines as 'Warranty Replacement ONLY', but reading parts of one of the original letters also implies that engines shipped to Parts Departments (for counter sales) may have also received the same type of serialized identification numbers...
See excerpt attached... with circled areas of text. (please excuse my crude circled notations!)..
The first and second circled statements seem to state that both service replacement (warranty) parts AND replacement parts shipped to Parts Departments would get the serialized ID numbers! And this would be in keeping with the Georgia requirement that all major components gets serialized ID numbers. What do you fellas think?
Also, addressing the question asked by opelitis1, the 3rd and last circled statement states
'... the service identification number is required IN ADDITION to the date stamp markings currently put on service assemblies. The identification number is to be located on the area of the stamp pad that is normally used for the production date stamp.' JohnZ had stated in an earlier post that such directives were not always followed by every part of GM... but that does allow that 'some' do, or sometimes did follow the directive to the letter (or at least as how they understood it)...