I checked our 2006 Civic Hybrid Valve Clearance today. I'll maybe post a more verbose report if anyone's interested. Here's some preliminary info: Sunday, December 07, 2008 km: 58370 * Checked valve clearances. Existing clearances measured: intake1:.009" intake2:.008~9" intake3:.009" intake4:.008~9" exhaust1:.013" exhaust2:.011" exhaust3:.012" exhaust4:.011" ---- Spec: Intake:.006"-.007" Exhaust:.009"-.011" ---- * Set intakes to: .006" * Set exhausts to: .010" Note, the service interval for this is well, I'm not sure what it is: it's part of the inscrutable Maintenance Minder system. I believe it works out to be over 100,000km, in conjunction with spark plug replacement. But 15 years or so back, the interval was 20,000km or yearly, whichever came first. So, thought I'd give it a go. Took lots of pictures, removed the bottom of windshield cowl and cowl cover, to fascilitate access. All-in-all, no major problems. Did discover a partial typo in the Shop Manual, in the picture showing orientation of cylinders 1 through 4. Everything in the picture is correct, except for the engine picture itself, which has the timing belt sprocket showing at the wrong end, which could lead to mistakes. The notations for "intake" (nearest the front) and "exhaust" (nearest the firewall) clarify things.