@ObscureSupercar Adding to this, i recall mention of Cadillac working on a V12-powered, full-size sedan around the time of the Sixteen's development and unveiling (this one aimed at production, though).
I think they tried to pursue the idea of a flagship until the Great Recession happened.
And that's pretty much it.
But to cap it off... while its said that Isuzu built 7 engines, we know of one that ended up in private hands, being those of Tamiya.
How?, well, maybe because Tamiya sponsored Team Lotus during that time.
The earlier V12 and the new one were nothing alike, so the old 102 received new engine mounts, a new bellhousing, bigger radiators and a redesigned engine cover (alongside, supposedly, an experimental 6-speed sequential gearbox).
The new car was christened the Lotus 102C.
... Move on to more rumours i mean, this next one involving Vernon Schuppan's team wanting to field the engine on a Lola chassis at the 1992 JSPC season, which never happened (the only "proof" being the registry of a Judd-powered, Schuppan-run Lola T92/10 for the opening race).
While Isuzu had enough parts to make around 10 engines, it seems that only 6 to 7 ended up built.
In regards to the test, statements on how many engines were provided vary from a single example to about 4, which were shipped to Lotus in july.
From Lotus' point of view, this was considered a good chance to regain their footing, as they, like many others, felt that they needed manufacturer support to continue in the new era (having previously failed with Chrysler/Lamborghini's support during 1990).