" Sluggo- a slightly off-topic but related question"........ errr No. Would love to know what thats about, sounds improbable so would like to see source material.
There is many apps in modern engines with "Stretchy" bolts and hardware, One time & throw away, There IS such a thing as cam ground pistons and bores that under torque, heated operating temps and loads the parts revert from egg shaped to round (Neat trick that!) And the HD Evolution Sportster engine is a marvel of engineering worthy of study how they pulled off that trick.
(Slightly more than just no eh?) But most recip piston type aircraft today and in the past are either Lycoming or Continentals of varying sizes. Flat 4s and 6s and are basically glorified VW engines.
They also run very low RPMS (1500-2800rpm) but engine loads are high based on algorithms of propellor length and pitch.
See:
https://www.lycoming.com/enginesBut, you made me look and cannot find any material related to such things. (A&P license holders have to access resource materials before initiating work) But there is such things as AC and ADs, A Advisory circular is FYI in nature and correct if needed, But a AD is directory, I dont understand why this is an AD, but fun reading all the same.
See:
http://www.dtic.mil/dtic/tr/fulltext/u2/a257220.pdf" SYNOPSIS
In this paper, the dynamic performance of the Ruston and Hornsby VEB diesel engine
connecting-rod bearing with circular and out-of-round profiles is analyzed. The effect of cavitation
M,., is considered by using a cavitation algorithm, which mimics JFO boundary conditions. The effect
,o of mass inertia is accounted for by solving coupled nonlinear equations of motion. The journal
profiles considered are circular, elliptical, semi elliptical and three lobe epicycloid. The predicted
journal trajectory and other performance parameters for one complete load cycle are presented for
all of the out-of-round profiles and are also compared with the predictions for the circular bearing"