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Re: 383vs400 crankshaft
[Re: Performance Only]
#1410717
03/30/13 09:56 PM
03/30/13 09:56 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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We'll just have to agree to disagree on that. I've balanced a lot of mopar engines and what your saying is not what i've seen in actual practice.
Some actual numbers would bolster your argument. As you know, machine shop balance and factory assembly line balance are way different.
The forged crank for the 1972 400 has the same part number (2268114) as the 383 from 1962-1971 which tells us there is no difference in the cranks.
John, 71 was the last year for the 383 and as you know, 72 was the first year for the 400. It stands to reason they wanted to deplete the old 383 cranks. I think we all know they'll physically interchange dimensionally. That does not mean that the component weights were the same. At the factory all they had to do was drill the counterweights differently. The pistons are not close enough in weight to just swap cranks from a 383 to a 400 and not rebalance it.
At some point you'd have to decide what is close enough, right? So in your opinion, what would be close enough? 30, 40, 60, 100 grams? typically anything more than 1 Oz.-inch will cause problems. (28 grams)
The factory tried to maintain 14 grams or less.. but
I know that varied somewhat
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