Try setting the preload at 1/2 turn and see if that helps. In my motor if preload is 3/4 turn they clatter a bit but with 1/2 turn they are perfectly quiet. If you have a filter with a check valve and you have tried 1/2 and 3/4 turn and still have the issue it may be your lifters are not up to the job. The best hyd flat tappet lifters made are the Hy-Lif Johnson's and you may want to upgrade to them.
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Tim Corcoran
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