Use a table ban saw to hack off the 340 piston crown .

VERY nice gesture! I wouldn't waste your time. When his junk blows, you know who he'll blame...
After actually doing some recalling in this thread I believe he was recommended to probably sell those and get the right Pistons I mean the creativity in the workarounds are pretty doggone redneck re-engineering science and I dig it, but man if you can get the stuff to work together the first time...
Can 1wildrt do figuring with a 3.79" stroke crank? Instead of the 4" crank? What's th .135" look like then?