The parts that are MOST-Likely used when spinning the crankshaft to simulate the correct weight are:

Question

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Bob weights are commonly used to simulate the weight of pistons and connecting rods during engine balancing. Counterweights are used to balance the weight of the crankshaft itself, but are not used to simulate the weight of other engine components. Ring grooves and plugs are not related to engine balancing or the simulation of weight during testing.

The Parts That Are MOST-Likely Used When Spinning the Crankshaft