Hi again,
Thanks for the speedy replies.
I thought that it could have been the seals. But how can I change them without removing the head? ie remove the springs without a lifter unless I could make up a lever with a slot or hole drilled into it? But there is still the problem of compressing the springs to remove the keepers from the valve stem.


And yes they are Zeniths but I wont even look at them yet.