How tight to set solid lifters

Hi all
I had posted earlier about a bbc I just put together for a blown jet boat.
I set the valves cold at .018
Took it to the lake the other day after running it around I put it on the trailer
Pulled the valve covers off with the Engine Hot the lash was now at .023
It had grown. 005 from cold to hot.
The cam spec is .022 hot
Pretty close.
This is a iron block with aluminum heads.
Also it only gets to 150 degrees.
In a car I would expect the lash to grow a little more around 180-200 ish...
Just my experience
Carry on