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Almost all of the engines are "Store bought"; built by the prominent engine suppliers. None are interested in building illegal "engines because of the damage that could do to their reputations. The risk/reward simply isn't there. Most of the power comes from the camshafts and from the head gasket up. The advances there now, are fairly slim because we have all been working on that since 1955. Chasis setups and the connection between the crotch and the brain of the driver play a much bigger part.
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