Mike , I'm with you, I just want to run as big a pushrod as I felt I could fit in there and the 3/8 was a touch too tight, the 11/32 weren't all that much more, cheap insurance I felt since I'm gonna be leaning on this thing a lot.

Terry made a good point that if your pass through in the head is borderline tight but not binding it's good for the pushrod because it acts like a guideplate in that it dampens the harmonics. Both ends of a pushrod pass through a non-linear arc so the rod oscillates/flexes i think more than people realize.