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→Z/28: Condense.
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→COPO 427s: Copyedit
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The COPO 9561 used the solid-lifter L72 big-block engine, rated at {{convert|425|hp|kW|0|abbr=on}} [[Horsepower#SAE gross power|SAE gross]] at 5600 rpm and {{convert|460|lbft|0|abbr=on}} of torque at 4000 rpm.<ref name="ultimatecar">{{cite web|url= https://www.ultimatecarpage.com/spec/4180/Chevrolet-Camaro-COPO-9561.html |website=Ultimatecarpage.com |title=Chevrolet Camaro COPO 9561 |editor=Wouter Melissen |date=December 2, 2009 |access-date=September 8, 2018}}</ref> Yenko ordered 201 of these cars to convert them into [[Yenko Camaro]]s.<ref name="myclassicgarage">{{cite web|url= https://www.myclassicgarage.com/knowledge-base/1969-Chevrolet-Camaro |website=Myclassicgarage.com |title=1969 Chevrolet Camaro |access-date=September 8, 2018}}</ref> Other dealers also became aware of the L72 engine package. Around 1,000 Camaros were fitted with the L72 engine option.<ref>GM Tonawanda engine production data</ref><ref>{{cite web |editor-last=Sonen |editor-first=Kurt |title=Camaro - 67-69 Camaro Model Information |url= http://www.camaros.org/model.shtml |website=camaros.org |access-date=November 15, 2020 |date=July 8, 2020}}</ref>
The COPO 9560 used an all-[[aluminum]] [[Chevrolet Big-Block engine#427|{{convert|427|cuin|L|1|abbr=on}} big-block]] called the ZL-1 and was designed specifically for [[drag racing]]. The package was conceived by drag racer Dick Harrell, and ordered through Fred Gibb Chevrolet in La Harpe, IL, with the intention of entering NHRA [[Super Stock (drag racing)|Super Stock racing]]. A total of 69 ZL-1 Camaros were produced. The engine alone
The ZL1 engines were hand-assembled in a process that took 16 hours each, in a room that Corvette Chief Engineer [[Zora Arkus-Duntov]] described as "surgically clean."<ref>{{cite book|title=Corvette: America's Star Spangled Sports Car |first=Karl E. |last=Ludvigsen |page=228 |year=1973 |publisher=Automobile Quarterly |isbn=9780525086451}}</ref> All the ZL1 engines were manufactured at the Tonawanda Assembly Plant before being installed in Corvettes and Camaros or sold over the counter to racers.<ref>''Auto Restorer'', December 2000, pp.14-15.</ref>
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