383 crank in 400

[flyinlow]

Will a steel 383 crank work in a 400 block?

[Cooter]

As long as the 400 was a Steel crank engine, and as long as everything is ok with the 383 crank, Yes.

However, it you plan on "Converting" a Cast crank 400 over to steel crank, you will need the 383 balancer, and rebalance the bottom end at the machine shop to internal balance. The cast crank 400 was external.

PS: Back in 1990, my brother did this with a 78 400, just swapped over everything.The engine lasted 3 weeks. Began to knock and no oil pressure. Vibrated like hell. Beat the front pump bushing out of the TF trans.

[Nacho-RT74]

plug and play job with balancing issues saved as stated... including remove counterweights on TC

[John_Kunkel]

The forged 383 crank and the forged 400 crank have the same factory part number. Although the 400 piston has a larger diameter than the 383, it has a lower pin height so the factory considered the balance to be the same.