Forged 273 crank in a 340 block

It will be absolutely necessary to re-balance the whole bottom end. This is because all 340 cranks including the cast cranks, had a hole drilled all the way through the front and rear counterbalance/main journal to lighten the heavier 340 piston/rod combo. The 273 crank tends to weigh more but the pistons/rods were lighter.