Back in my 20's i built a 1972 dart with a 440. I did just a totally stock rebuild on the 440 i pulled out of a '75 new yorker in the junkyard. I ran it for a while and decided i wanted to boost the compression a little and install a bigger cam. this was about 20 years ago and i didnt have a lot of money. I bought a set of .030 over sealed power L2355 'six pack' pistons very cheaply from a member on moparts at the time. So i took the block to the machine shop and had it bored for the pistons and new frost plugs and all and had the pistons installed onto the stock LY rods. The things i did NOT do are rebalance the rotating assembly and did not change the rod bolts. As everyone knows these pistons are so heavy that everyone thinks they are worthless. Fast forward to today and i get quite nervous 'hot rodding' around being i didnt rebalance or at LEAST install ARP rod bolts. Now, my not too distant plans are to get some trickflow heads and better cam to install on this bottom end, but when the time comes to get the new heads, i plan on removing the rotating assembly and having it balanced and changing the rod bolts so i will have peace of mind finally, especially with the better heads and cam. Now, Even though i built this almost 20 years ago, the engine probably doesnt have 1500 miles on it as i just cruise around every now and then and actually lost interest for a while so it didnt get driven much for a bit. I have run it up to 6000 rpm's a few times with no problem and it does run quite nicely but i cant get it off my mind that its not been rebalanced or the rod bolts changed so i constantly worry about breaking it. It may be close to a year before i take it apart to balance it and get the heads and i really would like to continue driving it and 'hot rodding' it until then. Im sure i am going to hear it for not at least changing the bolts, but have any of you done this back in the day and not had problems? I wouldnt worry about it if it had light pistons but these are HEAVY.