I am going to have to agree with the general concesus! Go with the RB20DET and you can have a reliable 400hp all day long. This is the motor i want to swap in eventually, but won't be going much higher than 330whp.
If you really want 600hp then go with either the rb25 or 26. I really, really, really, doubt you will be able to handle 600hp in such a small car as a 240sx. I am not trying to put down your driving skills in any way. I am just saying that is a MASSIVE amount of power, and you will never be able to plant all that power to the ground (not enought room for the amount of tread needed).
sorry to sound like a downer,
DbD
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