Umm....technically...the rod doesn't stretch when it's "Static"!!!
I never worried about all that "stretch" or growth" stuff with my BME aluminum rods, until I had it apart after 350 passes and saw shiney spots on my heads, and the pistons...figured .054 clearance was enuff, and it almost was...

"Livin' in a powder keg and givin' off sparks" 4 Street cars, 5 Race engines