Well though there is alot or red line and print from the proposed ruleset that the BOD is reviewing. As of the current proposed ruleset, it makes little sense to build anything other than a honda in STL. However, the PTB have stated that they are going to do someting about that.
Superior head design, amoung other things allow for high % gains compared to others. There was papers written to allow for non-usdm engines to allow for better options for nissan, ford, chevrolet, BMW, Toyota, and honda. However, the JDM v.s USDM isn't that big of a jump for honda compared to the other options in the lower displacement range.
Another option was written is to set almsot GT weights based on engines.
In my opinion choose a honda of your liking that has the best brakes and wheel base. Then build a B16 if your chassis can get down to weight, then build a B18. We will see what they do with the k20, but if that was me that is what I would do.
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