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

Don't think me stupid for asking this next question. ... Is mopars 4" crank measured by taking the .42" difference 4" - 3.58", is there only .21" throw added to the crank? Half on the top of the stroke and half at the bottom? or is all .42" added to crank equalling .84" if I measure bottom to top?