Sunday I had two of my mechanic friends over to listen to my noise.
They both agreed it is subtle and goes away above idle I am going to run it and enjoy my 29 warmed up coupe.
I called a model a engine rebuilder that did my main bearings he said piston to cyl clearance is the problem, noise does sound like piston slap but why it goes away with 1 and 4 cylinder shorted together does not make sense to me.I think I can check piston cly by dropping the pan with a feeler...
I rebuilt the motor and had professionals do the boring and main bearing work.
I am quite sure the cam plunger spring is in but where would that noise on the engine be most prominent?
DAVE