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

I Just want to measure the stock piston placement, with the 4" 318/390 or 3.79" crank mains are 2.5" in the 360 mains at 2.810" useing stock length rods. One Time deal. That will tell me too get the /buy the 3.79"or 4"crank with 360 mains. I have the 4" 318 crank in hand.