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5 About the only change we made to the stock Cleveland was to upgrade the cam. Not specifically a blower cam, the XE284H worked well on both our normally aspirated and supercharged configurations. The hydraulic flat-tappet XE284H offered a 0.584/0.588 split lift, a 240/246-degree split duration and a 110-degree lobe separation angle. Ideally we’d like to see the LSA a tad wider, but how can you argue with the results?