Back in the '70's era (and earlier) most (probably 99%) floated pistons/rods that the aftermarket was supplying/using were the "Waldes Tru-Arcs", they were in just about every TRW piston box when the pistons had the retainer grooves.
The real issue with this type of lock is the fact that they were "directional" and not too many shops were even aware of this fact! There was a "rounded" and "flat" side on these locks and literally thousands were being installed incorrectly by many decent race engine builders! They simply didn't know back then. The "rounded" sides needed to face the pins, the "flats" went to the outside. This was a very important issue back then and still is today when working with these style locks.
Very interesting information there^ Gary. I didn't know that.
^^^^^ Ding, Ding, we have a Winner
^^^^^ It is easy to $pend someone else Money. I do not see any real Power gains in floating wrist pins. Hell, there is probably more frictional losses across 3/4 of the floating pin compared to a press pin. This is going to be an ongoing debate. Four pages and over fifty replies, nobody has giving a Ligitment Documented H.P. increase. Just here say, personal opinion, theory, etc. Somebody stated it is easier to install & remove a floating pin set up. I agree with this if you are at a race and had to change a damaged piston. But during an engine build, it's a P.I.T.A.
Getting back to the original question in this thread, it took a BIG U-turn.
Nothing wrong with a press pin stock rod build. Save some Ca$h and take the Wife out to Dinner.
First, I NEVER intended to imply that there was/is anything "wrong" with pressed-in wrist pins. IMO this isn't about right or wrong anyway. This is about choices, and options. How many corners can be cut, or how many things an enthusiast needs, wants, or doesn't need/want in his engine build is up to each individual.
I was simply addressing the implication that floating wrist pins should be avoided merely because they can walk out of the rod IF/when they're installed incorrectly. My main point was that you can say that improper installation of many engine components, (including cheap OE type factory ones) can cause problems. Therefore I don't believe that the possibility of improper installation of the spirol loks on floating wrist pins is, or can be a selling point for pressed-in wrist pins.
BTW, I also didn't think that there's a huge difference in connecting rod/piston assemblies, merely due to them having floating wrist pins alone. But perhaps I am wrong about that. Either way, I do not agree with the premise to avoid any engine internal part, (including floating wrist pins) merely due to your engine builder possibly installing them the wrong way. If that is the case, then I guess you don't have a whole lot of confidence in the experience of your engine builder in the first place, eh?