Mopar 440 racers - time to legalize that shortblock!

[John Lang]

Originally Posted by RocketBlock

Really? Tell me how.
Because a 383 crank and a 400 crank have the same 3.375" stroke. A 383 block is 4.250" bore and a 400 block is 4.340" bore. So a 383 crank in a 383 block makes 383.03 cubic inches. A 383 crank in a 400 block makes 399.42 cubic inches. You could even put a 400 crank in a 383 block and make cubic inches.
See the pattern here?
But you could also put a 440 3.750" stroke crank in a standard bore 400 block after turning the main bearing journals down .125" and then you would have 443.80 cubic inches.

In 1958 Chrysler made a raised deck 383 with the 3.75 stroke, and a very small bore. Can't remember the bore size, it's an old age defect...... John Lang