13:1 Compression Pistons in 340 Small Block

Mmmmm not really so much savings on the stroker. The big changes in modern pistons is in the crown underside shaping, the general crown thickness, and the areas around the pin bosses. That's where 80+% of the weight is. That applies for stroker and non-stroker pistons.

KB's for 340 for example are 588 grams vs the stock 719 grams.... so minus 130 grams just in the casting and shaping changes. Drop another 22 grams in the pins. (And those KB's for the 340 are a bit thicker in the crown to push the dome up.) Those old forged domes ain't gonna be any lighter than stockers with the older designs.

The 360 stock stroke KB's are 510 gr vs stock 576 gr stock; drops to 478 gr for an equivalent KB stroker. Not all that different a change versus than the stock stroke ones; the general casting design makes a bigger difference.

You can see these same general casting/forging design changes for lighter weight show up in the 90's in production pistons in GM and Ford engines at the least.

BTW, not the place to do this, but at some time, I'd like to discuss this idea of power difference based on the head material.... This has showed up again recently.