ground 400 crank or new 383 crank? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-10-2007, 08:59 PM
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ground 400 crank or new 383 crank?

which is the cheaper way to go? which is better? if youve got a 400 crank, what would be the plus side of grinding it down for a 383?

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Old 09-10-2007, 09:38 PM
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400 or 383

I don't see any advantage in grinding a cast crank when you can find a forged or unmolested cast.my opinion.not sure,bUT IF IT WERE TUFTRIDED OR NITRIDED YOU WOULD DEFINITLY BE CREATING A WEAKER PIECE.i personally,i would look @the scat 9000 cast.
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Old 09-10-2007, 10:18 PM
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thanks for posting man!
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Old 09-10-2007, 10:26 PM
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The Mopar 400 and 383 cranks are the same.


Couldn't resist.
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Old 09-11-2007, 02:52 AM
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Quote:
Originally Posted by Centerline
The Mopar 400 and 383 cranks are the same.


Couldn't resist.
You're a troublemaker. I like that in a person.
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Old 09-11-2007, 06:28 AM
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If the choice is aftermarket cast or stock reground on the mains,take the stocker it far better in terms of strength and metallurgy.I have seen stock cast cranks last many seasons vs. scat ,eagle etc. they are good if you are lucky for about half a season before they crack.
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Old 09-11-2007, 07:14 AM
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Grinding down the mains on a 400 crank will move the oil holes toward the radius and you should pay close detail to that area.
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Old 09-11-2007, 11:02 PM
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Unless you have a certain sentimental attachment or your buddy owns that machine shop that is going to do that for you, there are so many cheap and high quality options these days. I'm guessing the 400 is a stock cast, the only real reason I would see so having a mchine shop do it for you is that you can tell them what you want done to it. But the way that I look at it you can buy a 383 forged from eagle or SCAT for the price of 30+ hours of labor the machine shop would have to do to make it worth your while. Just my two cents
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Old 09-12-2007, 05:29 PM
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Quote:
Originally Posted by CNC BLOCKS N/E
Grinding down the mains on a 400 crank will move the oil holes toward the radius and you should pay close detail to that area.
Good point. Could you slot the oil holes to bring the orientation back or would that weaken the crank? I know I've seen it done in the past.
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Old 09-12-2007, 05:55 PM
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Quote:
Originally Posted by techinspector1
Good point. Could you slot the oil holes to bring the orientation back or would that weaken the crank? I know I've seen it done in the past.

The worst thing is some of the holes are off a ton to begin with and when ground to 2.45 they end up right in the radius which makes it a week link. That hole has to be some what centered or the rod won't get no oil or a good supply of oil.

Last edited by CNC BLOCKS N/E; 09-12-2007 at 07:13 PM.
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Old 09-12-2007, 06:13 PM
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Quote:
Originally Posted by CNC BLOCKS N/E
The worst thing is some of the holes are off a tone to begin with and when ground to 2.45 they end up right in the radius which makes it a week link. That hole has to be some what centered or the rod won't get no oil or a good supply of oil.
Thank you.
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