Anyone ever use this brand for them? I've put them on my NA Z and drove the vehicle for a total of perhaps 50-80 miles with over the max CA limit (sometimes gross polluter) NOX as well as overheating due to a faulty radiator. I never let the engine completely overheat and have always left the hood open when cooling the vehicle back down. I was able to do this since it's at my shop and I don't stray away too far. Well I ended up pulling the plenum to clean the EGR tubes, of which were very clogged. Anyhow, I look at the intake valve cover rubber washers and they're all completely cracked and falling apart. I torqued the properly in a pattern as well...I'm wondering if this is from either or both the high NOX driving and precursory overheating?
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Ishino valve cover gasket set - inf20:56:01 07/06/12