I own and maintain several Honda Civics. I have tried 3 different brands of stem seals with no satisfactory results. Fel-Pro has been the best of the three brands so far. No instructions or tips were given to give you an idea of how to fit the gaskets to the mushroom portion of the valve cover bolts. Using Fel-Pro parts I was able to separate the metal frame from the gasket which adds a degree of elasticity and allows me to work with the gasket around the odd shaped valve cover bolts. With the Fel-Pro parts, I was able to fit 13 out of 16 seals, which isn't much. I just uninstall and install one at a time. To date I have not been able to install a complete set of 16 seals. I always think there is a trick to this process.
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