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

Yeah, and as I take the time to read more about the whole plan I get concerned for the success of the project... I can cut the pistons but typically that's a .030-.040 shave... By doing the math he might need as much as .135 I haven't seen a piston you can cut that much off and not have a thin crown... As well as balance issues.....

I'll cut them but I sure won't take responsibility for them..
VERY nice gesture! I wouldn't waste your time. When his junk blows, you know who he'll blame...