![]() ![]() 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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