Chevy 350 flat tappet cam3/2/2024 Roller cams also cannot be allowed to move fore or aft in the block for several reasons. To keep the alignment bar in place, Chevy uses an eight-legged "spider" that places one leg over each of the eight alignment bars in the lifter valley. Otherwise, the hydraulic part of the lifter operates the same way as a flat-tappet hydraulic tappet. This requires the lifter to be slightly longer in overall length both for this alignment bar and to create room for the roller. ![]() The factory takes care of this by designing two small flat spots on the lifter that accommodate a rectangular alignment bar that slips over a pair of lifters that prevents them from spinning. ![]() ![]() The most important point about roller lifters is that they must not be allowed to spin in the lifter bore for obvious reasons.
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