Assuming QuickSilver05 supplied the correct engine bore and stroke dimensions, here is how the engine size in liters is calculated:

cubic millimeters = bore radius **squared x pi x stroke x 8
cubic millimeters = 99.5/2 **squared x 3.14 x 90.9
cubic millimeters = 5654444.075
1 liter = 1000000 cubic millimeters therefore
5654444.075 / 1000000 = 5.65 liters which is approximately 5.7 liters

or in cubic inches:
cubic inches = 3.92/2 **squared x 3.14 x 3.58 x 8
cubic inches = 345.6 which is approximately 346 cubic inches

 

Seeing this argument reminds me of why manufactures used to go by cubic inches back in the day. I guess they gave into the europeans and started going by liters ("litres") I still go by cubic inches (I have a 318) because they are more accurate. Also, I didn't fall for all the hype of the hemi.
http://www.automobilemag.com/news/0407_hemi/
It's still a good engine though, as I wouldn't mind owning one. The things that keep me from owning one is the electronic throttle control, coil on plug distributorless ign. etc. I still favor "old" technology because it's been proven to work reliably and last 200K+ miles of "abuse".

 

I agree that the current HEMI is not like the HEMI engines of old, but as the article you posted a link to clearly points out, there are sloid, technologically based reasons for this. The newer HEMI is a surperior design reflective of how far modern engineering has come. The old HEMI is a legend, and don't get me wrong, I would absolutely LOVE to own an old 426, but there was good reason for improvement over the old design in the cumbustion chamber department. I whole heartedly agree on the point of electronic throttle control and all of that jazz. I would sooner have a cable connecting my right foot to the engine too, but oh well. And as far as the cubic inches vs. litres goes, I agree there as well. Besides, if you are going to go with an old school name like "HEMI", why not go with the old school cubic inches scheme too. Hey! You just gave me a great idea! How about a set of hockey stick stripes with "HEMI 346" on 'em. That would be cool!

 

conversion factor- Liters(5.7) x 61.024 = CU=347.8368

 

That only works if the Liters is already accurate, and since we've already don the math using the Bore and Stroke Measurements of the engine your conversion factor has become irrelevant.

You can not just use the conversion factor and assume that you are correct, the only true way to get the right answer is to find the volume using the bore and stroke measurements of the given engine.

 

For the sake of an argument, its close enough for the regular guy on the street.
Don't you think? Hell its close to you answer. and easy

 

It is definetly a 345Ci..