What is weight of stock 340 piston

Well that is about as easy as it gets, considering how heavy the stock 340 pistons are LOL. My 'stock' bobweight computations for the 340 is just over 2300 grams..... change over to KB pistons and SCAT I-beam rods and voila, you are suddenly at 1900 grams or under...! It'll be similar for any other aftermarket light piston, forged or hyper.

We did the KB's and SCAT I-beam rods on my son's 340 and bobweight ended up at 1893 grams, even with a set of SCAT rods that was a tad above average SCAT weight. About 45% of the bobweight reduction was from the pistons, and about 55% was from the rod change. Took 81-82 grams off each end counterweight of a cast 273 crank to balance. You would take more grams than that off of a 340 crank to balance it to a <1900 gram bobweight.