Hi Peter,
Just a point on the Honda engines. The OHV does have a gasket on the tappet cover. The OHC doesn't and is sealed up using goop(that's the technical term, lol). I'm almost certain that the intek does have a gasket but the IPL will tell us for certain when you get the numbers.
So, my guess is that the gasket is damaged and they've tried to rectify it with silastic to no avail.