Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: dennismopar73]
#1387247
02/14/13 07:39 PM
02/14/13 07:39 PM
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Belvedere500ci
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dennismopar73, What are you using for a cam? Flat tappet or Roller? What are your 60 foots? 4 link, Ladder bar car?
1967 Plymouth Belvedere II 383 1968 Plymouth Barracuda 383 2005 Ram 3500 5.9Diesel 1979 Dodge Power Wagon 360
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: Winchester 73]
#1387248
02/14/13 07:44 PM
02/14/13 07:44 PM
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dennismopar73
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well it is pretty cheap!! But Im intot he crank right bought couple 440 that had steel cranks in them which I still have 1 , getting them turned is $100 here, and that guy i know will turn down counter s for $100 ,, so, even if you get a crank for say $125 get the rest done cheap your into it cheap, I just reused my rods had them resized and ARPs bolts put in good to go, never bush the rods, because there is no HP there!! and I think it makes them weaker in the stock form, bore n hone is $125 , boil install freeze plugs another $80 I paid extra for the decking and line hone , I have more $ in my heads than I do the whole motor!!
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: dogdays]
#1387249
02/15/13 11:47 AM
02/15/13 11:47 AM
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JohnRR
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Mancini Overstock again, 4.15" stroke 383 main Eagle 4340 crank $500. Yeah, it's 10 under on both rods and mains, but so what? http://chucker54.stores.yahoo.net/384st6bo10ea.html R.
The problem with that crank is there isn't a rod available to use the common 1.32 shelf stock piston , rod needs to be roughly 6.580. the 4.15 crqank is ok for an RB build but low deck builds the 4.25 crank is a better choice.
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: Winchester 73]
#1387250
02/15/13 11:49 AM
02/15/13 11:49 AM
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JohnRR
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so nobody line bores?i thaught there was some debate as to it being better than grinding the crank?
anyone using a cast crank?
You can do that with a 400 block , but a 383 has thinner main webbing and it's not a good idea. 440Jim line bored his 400 block out to RB main size for a stronger crank, better main bearing selection and better crank selection at the time he did it .
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: dogdays]
#1387252
02/15/13 01:10 PM
02/15/13 01:10 PM
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StealthWedge67
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Well, JRR, yer right, save money on that crank and you'll spend it on rods or pistons. Bummer!
Regarding block and crank relative strengths, it seems to me that the stock blocks are failing before the cranks get into trouble. So it seems counterproductive to weaken a block that's already the weak link, in order to protect a crank that, even turned down, is the stronger link.
R.
I agree with this concept. The block obviously gets weaker when you bore the mainline, as the bearing saddle gets closer to the thinner parts of the main webbing. You'd have to show me how a crank gets weaker by cutting the main journals down, though. I could be wrong, but typically a smaller diameter of the same material is going to be stronger than a larger diameter.
In any case, I would suggest that the most cost effective way to build a stout rotating assembly is going to be to find a good forged RB crank and make the modifications there. Add a good set of newer H-beam rods with ARP capscrews (I'm not a fan of using 40 year old stock rods in a performance build), and a set of forged slugs. Makes for a pretty stout rotating assembly at a very reasonable pricetag.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: dogdays]
#1387254
02/15/13 01:42 PM
02/15/13 01:42 PM
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Belvedere500ci
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None this answer my questions. Its going off in a totally different direction. My 383 is all ready, that's the block I'm building. I'm either going to put it back stock stroke or 440 stroke. Who out there has a 431-438?
1967 Plymouth Belvedere II 383 1968 Plymouth Barracuda 383 2005 Ram 3500 5.9Diesel 1979 Dodge Power Wagon 360
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: Belvedere500ci]
#1387255
02/15/13 01:47 PM
02/15/13 01:47 PM
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Joined: Jan 2003
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JohnRR
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Quote:
None this answer my questions. Its going off in a totally different direction. My 383 is all ready, that's the block I'm building. I'm either going to put it back stock stroke or 440 stroke. Who out there has a 431-438?
I was going to build one and changed my mind and went bigger , 3.9 stroke.
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: StealthWedge67]
#1387256
02/15/13 01:50 PM
02/15/13 01:50 PM
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Posts: 75,280 A gulag near you.
JohnRR
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Quote:
Well, JRR, yer right, save money on that crank and you'll spend it on rods or pistons. Bummer!
Regarding block and crank relative strengths, it seems to me that the stock blocks are failing before the cranks get into trouble. So it seems counterproductive to weaken a block that's already the weak link, in order to protect a crank that, even turned down, is the stronger link.
R.
I agree with this concept. The block obviously gets weaker when you bore the mainline, as the bearing saddle gets closer to the thinner parts of the main webbing. You'd have to show me how a crank gets weaker by cutting the main journals down, though. I could be wrong, but typically a smaller diameter of the same material is going to be stronger than a larger diameter.
In any case, I would suggest that the most cost effective way to build a stout rotating assembly is going to be to find a good forged RB crank and make the modifications there. Add a good set of newer H-beam rods with ARP capscrews (I'm not a fan of using 40 year old stock rods in a performance build), and a set of forged slugs. Makes for a pretty stout rotating assembly at a very reasonable pricetag.
Jim's reasoning was because of overlap of the journal diameters, the longer the stroke the less amount of material in the journals is one straight piece front to rear, kinda makes sense but I don't know what difference it makes structurally ?
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: Belvedere500ci]
#1387258
02/15/13 05:37 PM
02/15/13 05:37 PM
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Posts: 27,421 Balt. Md
383man
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Quote:
None this answer my questions. Its going off in a totally different direction. My 383 is all ready, that's the block I'm building. I'm either going to put it back stock stroke or 440 stroke. Who out there has a 431-438?
I believe Mopar Muscle did a 431 a few years back with Eddy RPM heads. I believe its the one they put in a 65 Dodge Coronet and ran 11.70's with it. Ron
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: 383man]
#1387259
02/15/13 08:17 PM
02/15/13 08:17 PM
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I have a 431. Not a ton of racing times with it...last summer I was able to get a best 7.88 8th, 1.78 60ft, at 89mph. Put on a set of indy ez on, has a .570 Ultradyne 251@.050/278. There is alot of tuning to do yet. I run 4 speed and 4.10 dana. I have done nothing but find the weakest link since I put the ez's on it.
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: Belvedere500ci]
#1387261
02/15/13 09:32 PM
02/15/13 09:32 PM
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BSB67
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Quote:
None this answer my questions. Its going off in a totally different direction. My 383 is all ready, that's the block I'm building. I'm either going to put it back stock stroke or 440 stroke. Who out there has a 431-438?
Honestly, I've read your original post several times and have not responded because I really don't know what your question is.
"440 stroke in a 383. Good idea?".....Yes.
In the context of your question and the lack of any other information, any response will be of little value. Other than cost, I don't know what there is to evaluate. It's essentially comparing a 440 to a 383. Do you have some specific concern regarding the 431?
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Re: 440 stroke in a 383. Good idea? Post your combo/opinion
[Re: Belvedere500ci]
#1387264
02/16/13 02:20 AM
02/16/13 02:20 AM
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dennismopar73
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Quote:
None this answer my questions. Its going off in a totally different direction. My 383 is all ready, that's the block I'm building. I'm either going to put it back stock stroke or 440 stroke. Who out there has a 431-438?
Mine is a 437 love it !! go ahead and do the 440 crank in that 383
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