JIMS - Rocker Box Alignment Screws Options:Alignment Screws (604) NGK DR9EA spark plugs and

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JIMS - Rocker Box Alignment Screws Options:Alignment Screws (604) NGK DR9EA spark plugs andProduction tolerances on Twin Cam rocker covers can allow them to shift when being tightened. This can cause misalignment, which not only looks bad but can compromise the sealing surface. In high lift cam engines that have had the rocker covers relieved, misaligned covers can also cause rocker interference unless even more material has been removed. For these reasons, we have developed alignment screws to ensure that rocker cover alignment is correct.