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Are the Schubecks any taller or shorter than a normal lifter?

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The lifters shouldn't be any different than stock lifters unless you have them custom made. Do you have more info on those springs? If your going with a cam with 630 lift you might put yourself into a coil bind situation and that will break parts and flatten cams. I know that the sm lifters are expensive but the cost of wiping a cam is triple the amount of the lifters and they are completely reusable on other cams.