So I have an elderly gentleman who has a nice 55 Crown Vic that I am working on.

One of his original complaints was rough idle. After checking the valve lash,it was discovered that the valve lash was set at .002.

Once I corrected the lash (and tuned it up) the idle is now smooth as a frogs hair !

So now he complains that the engine was MUCH quieter before my work.

I patiently explain to him that the engine has solid lifters and that the sound he is hearing is normal.

He is ready to load the engine up with STP as he believes the additive will quiet the engine down.

I"ve done scads of Y Block valve adjustments and its completely normal.

My question to the group is  /   Is there a Ford document that states that there is some engine lifter/valve noise and that the sound is considered a normal operating situation?

I have looked thru the T Bird TSBs, 1957 Ford owners manual, 1957 Shop manual and a few other publications that I have searching for a statement about the solid lifter noise being normal operation with no luck.

Any suggestions ????   (Or should I just readjust them back to a nice quiet .002)

Oldmics