As rpm increases and the cam is allowed unbridled forward movement, this radically retards the ignition timing by as much as 20 degrees. But roller cam lobes cannot be ground with a taper so a button or other form of limiter must be used to prevent 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-1986, two-piece rear main seal small block Chevy to a roller, beyond just the cost of the cam and lifters, will also require a reinforced timing cover and a cam button to limit forward cam movement. (Image/Jeff Smith) Things You’ll Need to Consider for an SBC Roller Cam Retrofit But there are multiple advantages to hydraulic rollers that we’ll go over before we show how easy it is to convert a 1986 and later model 350ci small block Chevy to a roller. Yes, the cost to convert to a roller is higher than just replacing a flat tappet cam. Flat tappet cams had their day but if performance is your goal, one step that can really complement a good set of cylinder heads is the upgrade to a hydraulic roller cam.
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