I am looking to swap a 4.8l to a 6.0l. How well will the engine run without a tune, until I have time to get it tuned?

Would it be correct to assume it would not run very well?

 

it will start but it wont run well at all i would not recomend doing the swap without at least having sent out the computer for a base tune for the 6.0 the injectors will be different so the flow rate tables will be off the cylander volume volumetric efficiecny tables and lots of others will not be even close to correct if you run too lean you will blow the motor and if you run super rich you will wash out the rings and ruin the motor.