Motor Warranty of '69??

[Mike]

What was the standard Warranty period for COPO Camaros or Chevelles in 1969. Was it 1 year, 2 years, 3 years? In reference to that, was it possible that a 1969 COPO vehicles could have had a block replacement (under Warranty) as late as 1971?

I also have a question about casting dates. Could it be possible that a March built COPO Camaro or Chevelle have a 427 with heads that were cast in November '68?

Any help would be appreciated.

Thanks,
Mike