That would be nice Chris.
That's my first way out. Looks like I have three damaged pistons after all. The detonation must have been really bad. I'm lucky my cylinders weren't ruined.
I found some numbers on the Internet. The stock cast Pontiac piston in a 400 weighs in at 830 grams. This includes piston, rings, and pin. My Sealed Power pistons weigh in at 589 grams. This has to be without the pin, so I weighed my pin and it came in at 200 grams. The rings weigh 80 grams. So I imagine the total piston weight is 869 grams. So my forged pistons are just 39 grams heavier than the stockers.
HPP had an online article that stated that the total weight of a 400 piston, pin, and rod is 1,724 grams. I'm not sure if that includes rings. They didn't show any in the picture. If that's the case, then a stock rod weighs 894 grams. Add that to my forged pistons and you get 1,763 grams.
I read somewhere that if you don't have more than 50 grams of weight (+ or -), don't bother balancing the rotating assembly. If this is true, then that may be my second way out.
Jim Hand states in his book that stock rods are fine to use as long as you don't exceed 5800 rpm in a 400 or 5500 in a 455.
The Internet is full of 5140 rods. They go for about $238 to $250 and weigh in at 860 grams (+ or - 2 grams). Add my pistons to that number and you get 1729 grams. This is only 5 grams heavier than the stock rod/piston combo ! I think it costs $300 or more to get something balanced around here. If the rods are already sized correctly, this would be a third way out.
Of course this is all on paper. I'll have to locate an accurate scale and make some measurements myself.