I do have some mechaincal noise from under the cam cover! no too bad though, just a irregular tick tick. So do you guys thing I have damaged a valve guide? Ignition has to be ok. Would it be running out of fuel due to a blockage? That would be a cheap thing to fix. I think it is mechanical, like a colapsed valve spring.
Guys on the oldcorollas list are saying how their 4Ks will rev to 8000rpm with new stock valve springs.
I will pull the cam cover again, and take the cams and buckets off and have another look.