Quote:
Originally Posted by Jubsz
I'm trying to track down a valve cover to use, since I should have that replaced while the valve covers are off. I realized the 99+ valve covers are apparently different than the older ones. Is it just the fin design or are the internals and/or some of the holes/mounting points on the outside different? Does it makes sense that valve ticking would get louder as the engine warms up?
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I would go with OEM Toyota valve cover gaskets. No need to replace the valve cover itself unless cracked, just the gasket once you remove the valve cover to adjust the lifters/shims.
As the engine warms up and reaches normal operating temperature the oil becomes a bit thinner than when you first start the engine and the oil is cold. Not unusual for the valve train and specifically the lifters to get a bit noisier once the oil is hot.