i would imagine it matters for on road diesels as well since bore distortion even .001" will cause new wear points on the cylinder that didnt exist with headbolts.
1 thousandth of an inch is a lot. No way there's that much distortion. No way.
At most, I'd say less than 1 one hundred thousandths of an inch. Maybe more in the 1 - 2 millionths.
The cylinder bore gets distorted more when the crankshaft spins than you might think. In fact, the whole block twists under torque. It's why SBC's have to have 4 bolt mains if they're gonna routinely turn over 4500 RPM. They'll prematurely wear or even grenade on you because the castings were made for lighter weight as a priority over strength.
One reason why the 351 Windsor isn't used more for performance is that it has 3" Mains as opposed to the SBC's 2.25" (Doing this from memory so please feel free to correct me) Add to that the lack of roller lifters (except in the Lightning for a couple years and Cobra R) and.......
The Windsor was built for strength, not for RPMs. But you take it up to higher RPMs and the 3" mains can't take it very well.
It's a thing. It's about block distortion/twisting
But homey ain't buying the stud vs torque bore distortion theory or the align-honed distortion theory. Not on these blocks. (I'd be more apt to buy the align-hone distortion theory than the bore theory, but I ain't buying either)
I wouldn't give it a second's thought.
On a 20,000 RPM F1 engine? Oh yeah. On a Cummins? Not even.
I could be wrong, as usual but I need more evidence than some unnamed individual's opinion.