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7 If this is a new build or you don't have a variety of different pushrod lengths on hand for testing, you can use a pushrod length checker like this one from Powerhouse Products. The checker is essentially a short pushrod that uses a piece of threaded rod so it can be extended. Because of the threaded rod, the checking pushrod isn't very strong, so if you use one it's definitely recommended to swap out the standard valvespring for a lightweight check spring such as the one you see here. If you don't, it's likely you'll wind up with a bent checking pushrod and a lot of frustration.