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383 balance. #1179525 02/16/12 08:40 PM 02/16/12 08:40 PM
Joined: Mar 2008 Posts: 293 salem, oregon. usa E elmor OP enthusiast
elmor OP enthusiast E Joined: Mar 2008 Posts: 293 salem, oregon. usa	Have a 71 383. It's apparently externally balanced. What is the difference between it and externally balanced 400's, 440's and 360's? What can I use for a converter?

Re: 383 balance. [Re: elmor] #1179526 02/16/12 08:51 PM 02/16/12 08:51 PM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	check again 3IIRC all 383s were internally balanced.. I am truckless..

Re: 383 balance. [Re: 340SHORTY] #1179527 02/16/12 09:01 PM 02/16/12 09:01 PM
Joined: Mar 2008 Posts: 293 salem, oregon. usa E elmor OP enthusiast
elmor OP enthusiast E Joined: Mar 2008 Posts: 293 salem, oregon. usa	Seems I remember that the 71's were the last 383's made and they were externally balanced. This one came with a weighted harmonic balancer like I have never seen. I've had 360's, 400's and 440's that were externally balanced, but this is different.

Re: 383 balance. [Re: elmor] #1179528 02/16/12 09:07 PM 02/16/12 09:07 PM
Joined: Nov 2004 Posts: 843 Suffolk,VA I ireland383 super stock
ireland383 super stock I Joined: Nov 2004 Posts: 843 Suffolk,VA	Some 2 barrel 71's were externally balanced. Mine was an original 2 barrel with a forged crank (internally balanced).

Re: 383 balance. [Re: ireland383] #1179529 02/17/12 12:50 AM 02/17/12 12:50 AM
Joined: Jan 2003 Posts: 4,150 lewiston, ID C cornucopia
cornucopia C Joined: Jan 2003 Posts: 4,150 lewiston, ID	yup. some 1971 383s were externally balanced. they had the CAST crank.

Re: 383 balance. [Re: elmor] #1179530 02/17/12 02:19 AM 02/17/12 02:19 AM
Joined: Jan 2003 Posts: 75,015 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,015 U.S.S.A.	Quote: Seems I remember that the 71's were the last 383's made and they were externally balanced. This one came with a weighted harmonic balancer like I have never seen. I've had 360's, 400's and 440's that were externally balanced, but this is different. Then you need to use that balancer, the back end I have no idea but I assume it's close to the 400 ???

Re: 383 balance. [Re: JohnRR] #1179531 02/17/12 12:33 PM 02/17/12 12:33 PM
Joined: Jan 2003 Posts: 75,015 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,015 U.S.S.A.	someone said something naughty

Re: 383 balance. [Re: elmor] #1179532 02/17/12 01:49 PM 02/17/12 01:49 PM
Joined: Jan 2003 Posts: 9,436 Blair County,PA 62maxwgn master
62maxwgn master Joined: Jan 2003 Posts: 9,436 Blair County,PA	The 71 383 could have either if a two barrel motor.Damper is marked cast crank and engine I.D. pad will have the letter E on the pad.

Re: 383 balance. [Re: elmor] #1179533 02/17/12 03:58 PM 02/17/12 03:58 PM
Joined: Jan 2003 Posts: 25,808 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,808 Rio Linda, CA	All cast crank big blocks take the same external weight, the 360 needs a much larger weight. The INTERNET, the MISinformation superhighway

Re: 383 balance. [Re: John_Kunkel] #1179534 02/18/12 12:41 AM 02/18/12 12:41 AM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	yup. R.

Re: 383 balance. [Re: John_Kunkel] #1179535 02/18/12 04:00 PM 02/18/12 04:00 PM
Joined: Aug 2007 Posts: 6,095 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,095 Valencia, España	Quote: All cast crank big blocks take the same external weight actually 440 cast crank balancer it says FOR USE ONLY TO 440 CRANK or something like that soooo With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: 383 balance. [Re: NachoRT74] #1179536 02/18/12 04:01 PM 02/18/12 04:01 PM
Joined: Aug 2007 Posts: 6,095 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,095 Valencia, España	http://www.440source.com/dampers.htm With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: 383 balance. [Re: NachoRT74] #1179537 02/18/12 06:29 PM 02/18/12 06:29 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Here's the conundrum: ALL cast crank B/RB engines used the SAME amount of factory imbalance, yet my 400 harmonic damper says "for 400 only" same as the 440 referred to above. Presumably there is a special 383 cast crank damper as well. YET, they have the same balance specs and can be interchanged no problem. Chrysler was so intent on saving money they did a lot of weird things to save having two or three part numbers, yet here are three identical items with three castings. Bizarre. R

Re: 383 balance. [Re: dogdays] #1179538 02/18/12 08:06 PM 02/18/12 08:06 PM
Joined: Jan 2003 Posts: 25,808 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,808 Rio Linda, CA	The subject in the OP is converters and "all cast crank big blocks take the same external weight". The INTERNET, the MISinformation superhighway

Re: 383 balance. [Re: John_Kunkel] #1179539 02/20/12 02:05 AM 02/20/12 02:05 AM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Here is the first line of the post: "Have a 71 383. It's apparently externally balanced. What is the difference between it and externally balanced 400's, 440's and 360's?" R.

Re: 383 balance. [Re: elmor] #1179540 02/20/12 11:09 AM 02/20/12 11:09 AM
Joined: Jan 2003 Posts: 75,015 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,015 U.S.S.A.	Quote: Have a 71 383. It's apparently externally balanced. What is the difference between it and externally balanced 400's, 440's and 360's? What can I use for a converter? Get the flex plate from B+M , assuming that they all use the same weighted converter, and then you can use ANY neutral balance converter your heart desires .

Re: 383 balance. [Re: dogdays] #1179541 02/20/12 06:25 PM 02/20/12 06:25 PM
Joined: Jan 2003 Posts: 25,808 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,808 Rio Linda, CA	Quote: Here's the conundrum: ALL cast crank B/RB engines used the SAME amount of factory imbalance, yet my 400 harmonic damper says "for 400 only" same as the 440 referred to above. Presumably there is a special 383 cast crank damper as well. YET, they have the same balance specs and can be interchanged no problem. An engineer might disagree with the interchange notion; although the amount of imbalance is the same, the total mass of the inertia ring is probably deemed to be specific to one crank. The INTERNET, the MISinformation superhighway

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