340 crankshaft stroke

ANY time you change the stroke, you need custom pistons. EVERYTIME.
I guess that if you have say pistons that are .100 down in the hole you could concievably offset grind the crank .100 to get the piston to zero deck. But it would cost a lot more than just buying a correct piston in the first place. You'd have to go to a chevy type rod and then your pistons wouldn't work with those rods. afu.

don