The consensus on the slonaker Helix forum among the serious
gearheads is that you shouldn't even try adjusting the Helix
valve clearances. I know this SOUNDS stupid, but that
has been their finding. If I'm not mistaken (by bad memory),
the actual procedure is done by ear with the engine running,
so we aren't talking too critical. And as long as the engine
isn't ticking while running, then they are within spec!