318 to 400 questions?

[noff57]

Hey Guys,

I have 2 73 chargers one with a 318 and one with a 400. The car with the 400 is a parts car, but i would like to put the 400 in the 318 car.. What all will I need to do to covert? 

[bordin34]

You will have to swap the K-frame, then everything should just bolt right up. Also you may need to cut the passenger side inner fender,if you compare them, they are different.

[A383Wing]

transmissions are different, radiators are different, power steering, throttle cable, exhaust, misc mounting brackets for power steering, there's probably more, it's not a "drop-in" swap

[FLG]

What they said.

The fenders are different but the 400 will fit with the small block inner fender...i would know i have one.

[mopar73]

I did the swap with my 73 years ago.  there was plenty of room on the aprons.  I did not change the k frame or anything else, all I did was swap the whole drive train.  318/auto to 400/auto and 8.75.   the motor does sit slightly foreward or back from the "correct" position ( I don't remember which)  but there was no problems with it.