I used this kit on a 2006 5.3L Chevy Suburban engine, L59 Vin, Code Z, which is a general purpose fuel. I read other reviews before purchasing this product and I agree with the reviews on my valve cover gasket kit. There are other sets from the same company with bad reviews, but this model doesn't have bad reviews. Just follow the instructions and everything will fit perfectly, like mine, I cleaned everything with brake cleaner, I use a rag on the engine and a plastic brush on the valve cover, everything went very easily, after that I smeared some seal cleaner, very little , please, you don't really need it, but it helps the gasket get to any places the gasket might not seal, and also replaces the bushing on the bolts. This is a very simple and easy task, if you are like me and like your clean engine, spend more time cleaning than replacing the gasket, by the way the tightening torque for this particular engine is 12Nm but if you don't have a torque wrench tighten everything fully but don't pay too much attention to the jack they will tell you when enough is enough always start in the middle and make a few passes before the last one I hope all this info was helpful
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