I was on Camaro travel today and had a chance to make a few phone calls while at the airport.
In so many words, the PM rods are garbage. This is what I was told by two very well respected engine builders. Bub Whitiker from Burtonsville machine was one of them. Bub builds some of the best stocker and NHRA engines in the country, and is very well respected by many throughout the country. He installed the PM rods in one engine and the rod exited the oil pan and destroyed the engine. He'll never use them again. This has happened to many others running the late model LT1s at the track.
My other machine shop that I use for my restoration engine machine work throws them in the dumpster. I am not making this up. This is exactly what he told me. That's all they are good for according to him.
Bottom one is this, buy a set of 3/8" rods that are shot peened, magged with ARP rod bolts and you're ready to go. Costs for a set of rods like this runs $250-300. You can't beat that. I can even get them done if you wish. That's what we do here at CHP.
Also think about this, NHRA's Stock Eliminator class is one of the best test beds for much of what we do today in the hobby. For years, I've had stock 3/8' rods in my 302 race car. The onboard Racepac data logger computer does not lie about rpms. Two of my engines are abused to as high as 8600 rpm. No other engines take this asbuse unless it's a pro stock or modified eliminator engine. They rev highrer but remember they have light-weight aluminum rods.
Hope I've cleared this up.