as far as internal-style model codes go, the only things we've seen so far are car platforms, specifically the vivace/tograc being the cherrier "FCV" and the two generations of pessima being referred to as "VM301" and "VM501".
Thanks for replies! The reason I asked this is that I plan to release a mod soon that will swap in a Sunburst 2.0L engine, and I thought it would be easier to understand and familiarize ourselves with the engine name if it was on the mod. If the developer has an engine name in mind, I would like to know!
whenever I do an engine swap like that, I just call it "Hirochi 2.0L I4 engine", that way it's still immediately obvious what car it's come from.