A Matter Of Timing
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When bolted in place, as shown above, the spider places a load on eight horizontal tie bars that slip over the lifter. This arrangement works well at low engine speeds. However, if the engine enters valve float due to over-revving, it’s possible for the spider to bend, allowing the tie bars to pop off the lifters. The lifters are then free to spin in the bore, which will instantly destroy them along with the camshaft. This is an excellent reason not to over-rev factory hydraulic roller cam motors. View Related Article
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