Roller cam for tbi 3503/8/2024 ![]() ![]() With the timing chain cover and gear removed along with all the lifters, the original cam will slide right out.Ĭheck it out: How to Install Modern Gauges in Your First-Gen Camaroīeginning in 1986, Chevrolet upgraded the original small-block to a one-piece rear main seal and also modified the block to accept a hydraulic roller cam. 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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