... I think there's a corvette motor in my cuda.

mopar410 said

Am I mistaken,wasnt the 383 and 400 the same motor just different years?The 383 became a 400 after a certain year.

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I don't know what you mean "the same motor."

The 400 is the same block HEIGHT, so takes the same intake, distributor, etc.

The 400 is a larger bore, so it is "not" a 383

You would be correct in that the 400 pretty much replaced the 383. I think the reason was an attempt to regain some power because of the smog equipment, which made everybody look bad, lack of power, driveability, and mileage.