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Popping out the exhaust, or carb. Engine will run rough on acceleration. Pull the valve covers off, and sping it over by hand, watching to make sure all the valve stem heights are the same, at one point. A rocker arm will have accessive slack, at some point. A cylinder leak down test is the proper way, however, it requires several specialized tools.

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Q: How do you know you have bent valves in Chevy big block?
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