hey guy's, am I correct that I can simply swap my standard 400 cast crank with a 383 standard forged crank, & then use the 383 internal balance damper & neutral balance torque convertor. this will be a all stock 400 getting freshened up only. Thanks

You should get the rotating assembly balanced just to make sure. The 400 pistons are probably going to be a slightly different weight.

For a stock street build I don’t think balancing will be a real issue. Just get the correct front dampening for forged crank and remove the counterweights from torque converter or get a new one without counterweights.

A friend of mine already made it and he used Kb240 pistons instead the stock ones. Everything came out fine without really take the rotation assembly to the shop for balance. So far so good he haven’t noticed any kind of issue and has being driven the car for 2 or 3 years now. I was to make the same but then decided to stroke my 400

I did this to run neutral hays flywheel i had. I did have it balanced.

I put a 383 forged crank in the 400 in my dart, I used the balancer from the 383. I did have it balanced when it was built. No issues at all

Absolutely not a problem at all...perfect fit

FWIW, the Hollander Interchange shows the forged 383 and the forged 400 as a direct interchange.

You have a PM on this