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If the main housing bores aren’t parallel, it can create tight spots for the crankshaft. The worst case scenario is a spun main bearing, but more likely is simply unnecessary friction as the crank spins. It’s not death to an engine, but it’s wasted horsepower and if you’re going to the trouble to build a race engine you might as well ensure you’re getting all the power possible to the rear wheels. View Related Article
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