Many thanks to the Bolters who took the time to send me their thoughts.
I've been wondering, if a timing gear was loose, wouldn't it be more noticable at idle or wouldn't the timing go off so much that it wouldn't run right? Or start hard?
There is nothing to be seen or heard at idle. She starts right up withut a knock and drives very well - until the noise can be heard. Then, you can also feel a vibration that goes away if you drive faster. I have a feeling that it is worse when warm - but I'm not sure about that.
A friend has suggested that the two piece drive shaft may be the cause, but how could that make a noise? I've been thinking it may be the rubber in the original vibration dampner or maybe even the heat riser valve....
Thanks Guys. I'll let you know when I find the cause.
