Pulling the engine for new freeze plugs

back in the day,for a 340, a stock 4.040 bore was matched with an aftermarket forged
piston, 4.034 over for a wall clearance of .006...with wear a stock bore could
actually be 4.042/4.043 and you could end up with .008/.009..way too big.
....newer pistons/material now(2011)have smaller clearances.....

whatever piston you use, make sure you get the wall clearance right, it will save you
grief later on....