340 Rods, speed pro L2316F “stock” weight is more than stock piston

those pistons can be lightened by machining under the top inside . 25 grams isn't much to remove, it doesn't hurt piston. years ago, I would lighten my sealed power/trw this way . made them same weight as my cast pistons, didn't have to rebalance anything. i ran them in my 340, turned engine 7000 RPM , in traps many times. just food for thought.