What is weight of stock 340 piston

I can only say SCAT I-beams look good and have a good reputation; we did not subject them to any destructive testing (so far) LOL. One or more of the professional engine builders here have posted that, if you re-torque the rod ends multiple times on some of the foreign cast rods, you may eventually see some distortion in the big end dimensions. We just torqued ours 2x (plastigage check for bearing clearance and then the final assembly torque), so we presumably avoided any such dimensional change.

I think some of the guys like 70aarcuda have been hammering on a number of the SCAT rods for quite a while on the strip; don't know if those are the I-beams or H-beams. Those are the guys who have been seriously 'testing' them for some time.

The rod weights are advertised to be matched within +/- 2 grams, and our 1st set weighed out within a +/-1 grams total weight variation. With a close weight tolerance on the good aftermarket pistons, it makes balancing a lot less pricey for general hot rod use, where matching to within a couple of grams is quite adequate. I just weighed up the pistons and pins and ring and locks and bearings, combined that with the rod end weights listed on the SCAT box, used a standard bobweight formula from the Eagle site, handed the resulting bobweight number and the crank to the machine shop, and asked them to balance to that bobweight. The $$$ savings in doing it that way (plus going lower in bobweight, so you just take weight off of the crank) paid for almost half of the rods' cost plus an inexpensive but surprisingly accurate scale. Hard to beat that IMHO.....and I enjoy doing that type of work.