340 Cold Valve Lash Unknown Cam

Bewy said

If the correct lash is unknown, then you certainly do NOT want to set lash at 028/032". Many modern grinds use 018 -020" lash. Ultradyne [ now Bullet ] use 016 lash. Setting lash way too large slams the lifter into the cam flanks, & not the clearance ramps as designed, shock wave to the valve train.
For safety & long parts life with an unknown cam, you should set the lash to 012 - 014. It will not hurt anything but may idle rougher & lose some low end tq if cam was designed for 028/032 lash.
With experimenting I did on one of my 440s, stock head & block, I found no measurable difference in lash between room temp & operating temp.

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No one set the lash at .032. No one.

It was said to check the lash as it now is because it’s running and evidently not killing itself.

Since the OP or none of us know what the cam is, there is just as much possibility that the cam is a DC grind and the lash for most of those cams the lash was .028-.032.

So if per chance the OP finds them that loose he has no reason to panic and start changing lash. It may be what is called for and he can change the lash from there and observe the results.

I have seen some tight lash rollers that called out .010-.012 lash but he doesn’t have a roller cam.

I’ve also lash hydraulic roller lobes with solid lifters at .003-.004 but the OP doesn’t have that either.