Alum rods will split down the bolt hole from fatique just setting around torqued up--even if just on the shelf---

Dave---the longer rod will have a piston with a shorter compression height---distance from center of pin to deck surface--usually a much litghter piston

however--the ring pack will be more tightly gathered at the top of the piston and will usually have to have a spacer rail to support the oil ring--

with the piston grooves more closely to the top of the piston, the valve notches come closer to the back of the ring groove which creates a weak place for the top to break away will the slightest amount of detonation

pin oil holes also are quite varied in design with these short deck pistons, from nothing but a broached groove in the Probe stuff to drilled passages in others--
pin locks range fron single snap rings to tru arcs, dual tru arcs, triple spiral locks and a round wire type lock that combines with a beveled pin end to lock it in place

And unlike the fords---the chevs have right and left pistons depending on which cylinder valve arrangement---

and don't forget that we are now using the Honda bearing size in a lot of race engines --including 1400hp 500 cid pro stock type engines that run up past 10,000 rpm

sleep tight