I think you are wrong. changing the length of the connecting rods only will not give you larger displacement. You need to go larger P&C's and or a crank with a longer stroke. I just don't know what the normal approach to get to 2270 is. Possibly going to 103 or 104 P&C's may be easier and cheaper than a stroker crank. I had a big Type IV in a Porsche with something just shy of 2.5L displacement and it was extremely fast and bullet proof. I can't remember the bore and stroke of the engine. Some guy in NJ that used to frequent a 914 forum built these big Type IV engines. He owned a shop that specialized in Bentley's. This was back in the late 1990's. I would love to find this guy ,if he sounds familiar to anyone let me know. All of my old emails are long gone.