These 1zz up thru 2008 ENGINES SIMPLY are OVER GROWN MOTORCYCLE ENGINES w/ dual over head cams. As SUCH, THEY DO NOT HAVE HYDRAULIC valve LASH ADJUSTMENT LIKE OLD CHevy's. Your owner's manual says check them every 60k. I checked mine @70k. All mine were dead center of the "spec". Dealer will hit you up for 2 hours to check them BUT the engine must be dead cold. And a good dealer will tell you to drop the car of the night before they do it. Bad news is if any are out of spec. This is an expensive and involved job....5-6 hours...if they have the parts. FYI...GM dealers do not stock the parts...the lifter buckets. And most Toyota dealer may not have the parts either. It's $20/lifter from toyota. But that's small change compared to the labor you will pay...$500-$600. If you valves are "too tight" lack of clearance...you can burn a valve damaging the engine. Dealer by me has seen this damage at least once. I hope your toyota dealer is a good one. This is something you want done properly. Starting 2009 model year I believe all Toyota engines have gone to hydraulics...basically because they are afraing of the E15 coming out which absolutely causes valve wear. We only have this valve wear issue due to E10 now and the possible coming of E15 only makes it worse. aka ...ethanol is killing your engineoldsman350 wrote:What is valve lash and how is it checked? I wish I would have checked my post before I told them yes. Guess I just ate $129. Got an alignment done as well today.