Editing Chevrolet big-block engine (section)

==Mark III==
Richard Keinath, the original Mark II and IV design engineer stated that the MK III was a regular MK II design with a larger bore, but the [[Tonawanda Engine|Tonawanda plant]] didn't want to cast a block with a bore that large. The rumor that Packard's V8-engine tooling and production rights were considered for purchase by Chevrolet, was evidently true but never came to fruition.<ref>{{cite book |last=Gabbard |first=Alex |title=Fast Chevys |year= 1989 |publisher=[[The Quarto Group|Motorbooks International]] |isbn=978-096226080-3}}</ref><ref name="Mark III">{{cite web |url=http://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?viewmode=compact&topic_id=1569&forum=3 |title= Did Chevy consider Packard V8 BB Design? |publisher= Packard Info Forum |access-date= 11 June 2017}}</ref>

The Mark III was supposed to be a Mark II with bigger bore centers, but it never left the drawing board due to high tooling costs.<ref>{{cite web |url=https://www.motortrend.com/how-to/big-block-chevy-buyers-guide/ |title= Chevy Big-Block V-8 Buyer's Guide |author= Jesse Kiser |access-date= 22 January 2023}}</ref>