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Old 05-24-2004, 05:14 PM
frankenvette's Avatar
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How to tell hydraulic from solid lifters?

Here's my delima. . . I bought a Nova with a 406 and the original owner did not have the cam card. I have tried and exhausted all avenues of finding the cam manufacture with the exception of mechanical options. My original thought was to take the valve covers off and measure the lash, assuming I could arrive at a measurement that I could rely on. However, now the question is weather the lifters are solid or hydraulic. To my ear, they are solids. The way I understand it is if they are hydraulic, the measurements would not be accurate, as the lifters wouldn't be under pressure, and could give a false reading? I have been advised to remove the intake and this would give me a clear view of the lifters, making clear identification possible.

What would you do?

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Old 05-24-2004, 05:18 PM
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Hydraulic lifters are set with a preload - the lifters are adjusted to compress the lifter plunger at all positions on the cam - so there is no measurable valve lash. If you take off the valve cover and can measure some lash, you have solid lifters. If there is no clearance, it is a hydraulic.
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Old 05-24-2004, 05:47 PM
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You can push down on the rocker arm and get some movement out of a hydraulic lifter. There should be a little play in the lifter plunger.
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Old 05-24-2004, 06:20 PM
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Sweet, I knew there had to be an easier way. The 3-day weekend should give me pletty of time to sort this out.
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