I'd consider allowing both V6 and inline four units at 1600cc, with different rev limits a la Super 2000 touring cars. You could even dyno test the engines. The issue is V6 engines are more theatrical for F1, but they are rarely used at that sort of size - the only 1600cc V6 car I can think of is the early 90s Mitsubishi lump that got stuck in the Lancer and might be plodding around in a few Protons?
I see advantages to both V6s (show, prestige manufacturers) and I4s (road relevancy) exclusively; I suppose allowing both is a reasonable compromise.
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