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You either have the WRONG push rods in it, or you are not adjusting the valves correctly. There is a special way to adjust the valves and it would take to long to explain it to you. They don't just tighten all the way down. You need to get a book and READ about adjusting the valves.

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Q: Why would the push rods be bending in a Chevy 400 motor when its not running yet?
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