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If your talking about retro fit hydraulic roller lifters can they be used on a hydraulic roller cam the answer is yes. They can be used on retrofit style roller cam's as well as oem style roller cams but they need to be a hydraulic roller cam. You can not use flat tappet lifters on any roller cam or any type of roller lifters on a flat tappet cam.
Have read some people try to use solid roller lifters with hydraulic roller cams and vice versa and that is not a good thing to do. Hope that helps you out.
Eric
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