[TimG]

I don't think that the warranty replacement would be considered an original motor. If you purchased a new 1967 Corvette and the motor exploded within 11 months of ownership, chances are that you would now have either a short or long block warranty replacement motor. It may or may not have CE stamped on it depending on the damage and availability of parts. It would, more than likely, have a block and possibly components that could have part numbers for a 1968 vintage car and the motor may have a casting date up to 11 months later than the assembly date of the car. If someone offered me a 1967 435 Corvette with a replacement 3904351 four bolt block with a casting date 30 days before the assembly date of the car or a CE motor with evidence of factory warranty replacement, I'd choose the correctly dated block. This is just me, I think there is value having a replacement motor of correct part number and casting date vintage. People can always say a replacement motor is a warranty replacement motor and this would be very hard to prove.