Re: cast 400 or 383 steel crank
[Re: westdart68]
#1138199
12/17/11 07:34 PM
12/17/11 07:34 PM
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Joined: Aug 2003
Posts: 4,384 Madison Wi
NTOLERANCE
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master
Joined: Aug 2003
Posts: 4,384
Madison Wi
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400 pistons are heavier than 383 pistons.
It will vibrate...
I used to care but....... things have changed
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Re: cast 400 or 383 steel crank
[Re: NTOLERANCE]
#1138200
12/17/11 08:53 PM
12/17/11 08:53 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
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Posts: 25,618
Rio Linda, CA
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Most sources show the forged 400 and the forged 383 cranks as a straight interchange.
The INTERNET, the MISinformation superhighway
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Re: cast 400 or 383 steel crank
[Re: westdart68]
#1138204
12/18/11 01:02 PM
12/18/11 01:02 PM
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Joined: Jan 2003
Posts: 74,907 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
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Have the rotating assembly balanced, trying to find the correct external balance flywheel USED, is going to be next to impossible. the balance job from the factory wasn't that good to begin with , do yourself a favor and have it balanced using the forged crank.
Next dumb observation ... rotating assembly KIT ??? be careful , 400's were low compression from the factory there are very few pistons available that aren't .100 or more in the hole, any would be from companies like ross, diamond, etc ...
Sounds like you are trying to do this on the cheap, you may be disappointed with the outcome.
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Re: cast 400 or 383 steel crank
[Re: JohnRR]
#1138205
12/18/11 05:52 PM
12/18/11 05:52 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
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On the subject of 383 versus 400 internal balance, keep in mind that forged crank 383's all had higher compression height than any 400 so the extra weight that comes from the larger diameter of the 400 piston is offset by the taller compression height of the 383; since the rods and pins are the same, the bobweight would probably be near the same for both (within factory tolerances).
The INTERNET, the MISinformation superhighway
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Re: cast 400 or 383 steel crank
[Re: JohnRR]
#1138207
12/18/11 09:07 PM
12/18/11 09:07 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
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My argument is to why the forged 383 and 400 cranks are an interchange in original form.
The INTERNET, the MISinformation superhighway
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Re: cast 400 or 383 steel crank
[Re: John_Kunkel]
#1138208
12/19/11 11:51 AM
12/19/11 11:51 AM
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Joined: Jan 2003
Posts: 74,907 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,907
U.S.S.A.
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Quote:
My argument is to why the forged 383 and 400 cranks are an interchange in original form.
I'm not trying to argue that point , just pointing out something so the OP doesn't think he can stick a lightweight aftermarket piston or lighter than stock KB piston on the 383 crank and not have to rebalance it.
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