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I was discussing the Tahoe Hybrid with a Chevy tech this evening and it seems that the the ECU disengages the lifters for those four cylinders. The engine uses push rods, but the tech theorized that it could be applied to an OHC engine as long as it had rocker arms near the lifters that would allow for the lifters to disabled (sounds like it wouldn't work on a Honda/Toyota). Some other worlds were mentioned, but I don't remember the specifics.
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