Re: COPO 427 ?
It could be for a number of reasons including special suspension or shocks, heavy duty radiator (AC radiator in an non AC car), special wiring harness, towing package in a car it's not available, special gearing. I don't know if any or all of these would demand a COPO order, but they could. Weren't there some special order 4 banger Novas that John Z talked about? They had a crummy drive-train combination that made them barely able to climb a hill, but they built them under the COPO designation.
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