Originally Posted by wstar

I would *guess* that the factory lift spec for the adjuster is so they can have reasonable mfg tolerances. e.g. some of the VVEL units mfg'd will have slightly different physical limits, but the factory spec is something that all VVEL units can be adjusted to at the factory with those bolts. You might find that some engines have more leftover room on the adjust than others (or even different on the two sides of one engine, and you really want them to match up perfectly). Still, even assuming most engines have some usable adjustment headroom on both sides and you could adjust them perfectly in sync with each other, and it doesn't cause physical contact, you're left with question marks about whether the stock ECU can deal with that safely, and/or what (possibly unknown) tuneables to tweak there to make it work right).