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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...

Technically it does when its hot, but if the word static is twistin your panties we can change to mechanical compression and back to the point which you kinda answered in a backassward way, I am guessin you were running a .040 head gasket and you had some form of interference @ .054 than .019 was the rod gain ,<.035 min for steel rod> I can add that to my static compression math and come up with a more realistic number, thankx