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  1. 9

    4.0 OHV roller rockers being developed by Harland Sharp

    Probe Industries was the first company that made the setup but they have since abandoned them unless you can come up with a bulk order of 100 sets is what i was told. The ratio is gonna be 1.6. I have a friend who used to be an engine builder for a busch team and he said the best gain you could...
  2. 9

    4.0 OHV roller rockers being developed by Harland Sharp

    Just in case anyone is interested I talked to Harland Sharp ( www.harlandsharp.com )yesterday and he is in the process of making a shaft roller rocker setup for the 4.0. Its in the development stage but he hopes to have it ready in about a month. i think he'd like a little backing, so contact...
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