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I don't work on one of the cars, so someone else will probably have a little better answer on bore/stroke combinations to get to the max of 360 ci specified in the rules.
They used to have to be a cast iron block. I just checked the rules and see this has changed, but if you run an aluminum block, you have to bolt an additional 35 lbs to the chassis on each side of the engine.
The accessories on the front of a lot of the engines are different than a typical sprint car engine to allow for the starter shaft. Normally on a sprint car the water pump is driven off the front of the crank and the oil pump drives off the cam. Because the starter shaft on a champ car has to engage the front of the crank, a lot of the cars run belt drive water and oil pumps to make room for it. The other way around this is to run an onboard starter on the back of the engine, but it takes up a lot of space in the cockpit and adds weight.
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