Same rod. Saw a pic of an MVVS 60 or 77 rod that was MASSIVE.

They ran these engines with these same rods for years turning 13 and 14 inch props as well as 12/12.5 x 11/12 props. Ask flywilly. He flew a few of them for over 1000 flights with 13" props. Besides, I have several RF/SF engines and a couple spare NIP rods and can always have a rod re-bushed if needed. I ain't skeerd! Guess a guy could even get a heavy duty one made if he had the tools/skills or knew a machinist.

Terry in LP