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Maybe am I wrong, and correct me if I am.
Corvette 5.5L history is this:
In 2009 corvette racing switched to GT2 after le mans, katech destroked the LS7R to 6L allowing the car to score points in ALMS.
In 2010 GM dropped katech as engine tuner/supplier and designed in house a new 5.5L engine to suit FIA/ACO GTE/GT2 tech rules. It's still based on the road LS7 but extremely tuned to work as a dyno like katech ls7r was.
Season by season GM kept on developing and evolving this engine.
In late 2013 they added fuel DI because new road LT1 engine was equipped, so it could be equipped in the racing engine too.
That's the reason I wrote that corvette C7R is an "almost" bespoke engine, because is some kind of stand alone platform.
No matter what new kind of engine series a road corvette may be powered, C7R will keep on using the 5.5L base.
You're wrong about corvette DP.
2012-2013 corvette DP engine was a 5L
(mandatory displacement for V8 in grand-am. Ford R&Y V8, BMW dinan V8, Porsche cayenne derived V8, GM V8 were all 5L because of rules)
2014-2016 corvette DP engine was updated by ECR and enlarged to 5.5L
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