![]() This can be as much as 20 degrees of retarded timing, which is why the effort to install a cam button is so important. If the button is not used, the cam moves forward as rpm increases, which will radically retard the ignition timing. But roller cam lobes cannot be ground with a taper so a button must be used to limit that forward motion. The addition of a cam button is critical because flat tappet cam lobes are ground to offset the forward motion created by the distributor gear. This requires a button that presses against the inside of the timing cover to minimize forward cam travel. To update a pre-’86, two-piece rear main seal small-block Chevy to a roller, beyond just the cost of the cam and lifters, the conversion will also require a reinforced timing cover and a cam button to limit forward cam movement. We opted to upgrade the valvesprings to a set of LS6-style beehives along with guided roller rockers mainly because stock stamped-steel rocker arms do not offer sufficient slot travel to accommodate 0.550 inch of valve lift. It does require a few parts to complete a hydraulic roller cam conversion beyond just the cam and lifters.
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