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MP 3.79" cranks #1794564
04/02/15 12:16 AM 04/02/15 12:16 AM
Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61 Offline OP
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justinp61  Offline OP
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W. Kentucky
I have a MP 3.79" P4529715 crank, the info I've found shows it's a 1053 steel 6 bolt flange. Mine is an 8 bolt flange which according to the info I've found is 4340 with the p/n P4876788. Anyone have any info on these cranks?
Re: MP 3.79" cranks [Re: justinp61] #1794565
04/02/15 12:50 AM 04/02/15 12:50 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
I have 3, 3.79 cranks 2 are billet and 1 forged.. all
are 6 bolt.. I cant help with a 8 bolt.. never seen one
Re: MP 3.79" cranks [Re: justinp61] #1794566
04/02/15 02:12 AM 04/02/15 02:12 AM
Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda Offline
master
70AARcuda  Offline
master

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Posts: 9,826
las vegas
Quote:

I have a MP 3.79" P4529715 crank, the info I've found shows it's a 1053 steel 6 bolt flange. Mine is an 8 bolt flange which according to the info I've found is 4340 with the p/n P4876788. Anyone have any info on these cranks?



yes..the 8 bolts are 4340. Had a 3.58 stroke 340 main billet crank 8 bolt....part number was stamp on counterweight...Sold it...

Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
Re: MP 3.79" cranks [Re: 70AARcuda] #1794567
04/02/15 11:36 AM 04/02/15 11:36 AM
Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61 Offline OP
I Live Here
justinp61  Offline OP
I Live Here

Joined: Oct 2003
Posts: 11,684
W. Kentucky
Mine is an 8 bolt but the p/n stamped on the counter weight according to what I've found is a 1053 6 bolt. Gotta love Ma Mopar.
Re: MP 3.79" cranks [Re: justinp61] #1794568
04/02/15 01:19 PM 04/02/15 01:19 PM
Joined: Jan 2003
Posts: 2,533
Alexandria, LA
B
Blucuda413 Offline
master
Blucuda413  Offline
master
B

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Alexandria, LA
I have an eight bolt 3.79 crank but I didn't know there was a possibility of it being 4340 steel.
Re: MP 3.79" cranks [Re: Blucuda413] #1794569
04/02/15 01:25 PM 04/02/15 01:25 PM
Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61 Offline OP
I Live Here
justinp61  Offline OP
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Posts: 11,684
W. Kentucky
I copied this from another site so I don't know how accurate it is.

HD cast cranks

P5007256 4.00" stroke, 318/340 mains
P5007257 3.58" stroke, 318/340 mains


Forged cranks

P4120312 3.45" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4120504 3.31" stroke - 8-bolt flange - 1053 steel - 318/340 main
P4529709 3.38" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529710 3.51" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529711 3.55" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529712 3.60" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529713 3.65" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529714 3.71" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529715 3.79" stroke - 6-bolt flange - 1053 steel - 318/340 main
P5007252 4.00" stroke - 6-bolt flange - 4340 steel - 318/340 main
P5007253 3.58" stroke - 6-bolt flange - 4340 steel - 318/340 main


4340 steel billet cranks

P4876013 3.55" stroke - 6-bolt flange - 318/340 main
P4876014 3.50" stroke - 6-bolt flange - 318/340 main
P4876015 3.48" stroke - 6-bolt flange - 318/340 main
P4876016 3.45" stroke - 6-bolt flange - 318/340 main
P4876065 3.35" stroke - 6-bolt flange - 318/340 main
P4876066 3.385" stroke - 6-bolt flange - 318/340 main
P4876067 3.42" stroke - 6-bolt flange - 318/340 main
P4876788 3.79" stroke - 8-bolt flange - 318/340 main
P4529802 3.50" stroke - 8-bolt flange - 318/340 main
Re: MP 3.79" cranks [Re: justinp61] #1794570
04/02/15 01:37 PM 04/02/15 01:37 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

I copied this from another site so I don't know how accurate it is.

HD cast cranks

P5007256 4.00" stroke, 318/340 mains
P5007257 3.58" stroke, 318/340 mains


Forged cranks

P4120312 3.45" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4120504 3.31" stroke - 8-bolt flange - 1053 steel - 318/340 main
P4529709 3.38" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529710 3.51" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529711 3.55" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529712 3.60" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529713 3.65" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529714 3.71" stroke - 6-bolt flange - 1053 steel - 318/340 main
P4529715 3.79" stroke - 6-bolt flange - 1053 steel - 318/340 main
P5007252 4.00" stroke - 6-bolt flange - 4340 steel - 318/340 main
P5007253 3.58" stroke - 6-bolt flange - 4340 steel - 318/340 main


4340 steel billet cranks

P4876013 3.55" stroke - 6-bolt flange - 318/340 main
P4876014 3.50" stroke - 6-bolt flange - 318/340 main
P4876015 3.48" stroke - 6-bolt flange - 318/340 main
P4876016 3.45" stroke - 6-bolt flange - 318/340 main
P4876065 3.35" stroke - 6-bolt flange - 318/340 main
P4876066 3.385" stroke - 6-bolt flange - 318/340 main
P4876067 3.42" stroke - 6-bolt flange - 318/340 main
P4876788 3.79" stroke - 8-bolt flange - 318/340 main
P4529802 3.50" stroke - 8-bolt flange - 318/340 main



This looks like it was cut and pasted from the MP
book... but its one of the newer books because of some
of the PN... 5007 is newer stuff... but this also
shows the 3.79 billet as a 8 bolt.. both of mine are
6 bolt... MAYBE they changed over to a 8 bolt in
the last few years... let me go look at some of my
MP books and see whats in them
Re: MP 3.79" cranks [Re: MR_P_BODY] #1794571
04/02/15 03:35 PM 04/02/15 03:35 PM
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
cheapstreetdustr Offline
master
cheapstreetdustr  Offline
master

Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
is an 8 bolt flexplate hard to find?/
or is it a flywheel/clutch issue.

365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
[image][/image]
Re: MP 3.79" cranks [Re: justinp61] #1794572
04/02/15 05:09 PM 04/02/15 05:09 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

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Posts: 52,972
Romeo MI
Of the few MP books I have I dont show any 3.79 forged
8 bolt ones.. my last one book is 2002

Re: MP 3.79" cranks [Re: MR_P_BODY] #1794573
04/02/15 07:27 PM 04/02/15 07:27 PM
Joined: Jan 2003
Posts: 2,533
Alexandria, LA
B
Blucuda413 Offline
master
Blucuda413  Offline
master
B

Joined: Jan 2003
Posts: 2,533
Alexandria, LA
Mike, it does show fordged 8 bolt in either my 1995 or 2001. Can't remember which.
Re: MP 3.79" cranks [Re: Blucuda413] #1794574
04/02/15 08:23 PM 04/02/15 08:23 PM
Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61 Offline OP
I Live Here
justinp61  Offline OP
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Posts: 11,684
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Quote:

Mike, it does show fordged 8 bolt in either my 1995 or 2001. Can't remember which.



Does it show them as 1053 or 4340?
Re: MP 3.79" cranks [Re: Blucuda413] #1794575
04/02/15 08:24 PM 04/02/15 08:24 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

Mike, it does show fordged 8 bolt in either my 1995 or 2001. Can't remember which.



In my 2001 book it shows a 3.79 forged 6 bolt 1053
material but not a 8 bolt.. they did/do offer a billet
3.79 with a 8 bolt flange( this data is from my 2001 book)
Re: MP 3.79" cranks [Re: justinp61] #1794576
04/03/15 05:48 AM 04/03/15 05:48 AM
Joined: Jan 2003
Posts: 19
Sweden
S
sbdemon Offline
member
sbdemon  Offline
member
S

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Posts: 19
Sweden
Hi

The P4529715 crankshaft is, surface hardened, forged 1053 steel, radiused fillets main and rod, eight-bolt flange, 318 mains, according to the 97 and 98 MP catalogs. I have one in my engine.(pic is from MP catalog).


sbdemon

8479449-CAM00053.jpg (365 downloads)
Re: MP 3.79" cranks [Re: sbdemon] #1794577
04/03/15 09:40 AM 04/03/15 09:40 AM
Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61 Offline OP
I Live Here
justinp61  Offline OP
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Posts: 11,684
W. Kentucky
Thank you sir.

Re: MP 3.79" cranks [Re: justinp61] #1794578
04/03/15 11:57 AM 04/03/15 11:57 AM
Joined: Jan 2003
Posts: 9,872
Weddington, N.C.
Streetwize Offline
master
Streetwize  Offline
master

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Posts: 9,872
Weddington, N.C.
I had an 8 bolt 3.55" in my little 318/341 with 6" aluminum rods. I remember it was a PITA finding a flexplate for it.

WIZE

World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker!

https://www.youtube.com/watch?v=-mWzLma3YGI

In Car:

https://www.youtube.com/watch?v=PjXcf95e6v0
Re: MP 3.79" cranks [Re: sbdemon] #1794579
04/03/15 12:50 PM 04/03/15 12:50 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

Hi

The P4529715 crankshaft is, surface hardened, forged 1053 steel, radiused fillets main and rod, eight-bolt flange, 318 mains, according to the 97 and 98 MP catalogs. I have one in my engine.(pic is from MP catalog).


sbdemon



That same PN in my 2001 book shows it to be a 3.79
6 bolt 1053 crank... so I gather that PN will/can
be either a 6 or 8 bolt 3.79 1053 crank

Re: MP 3.79" cranks [Re: MR_P_BODY] #1794580
04/03/15 12:56 PM 04/03/15 12:56 PM
Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61 Offline OP
I Live Here
justinp61  Offline OP
I Live Here

Joined: Oct 2003
Posts: 11,684
W. Kentucky
Now I need to decide if I want to run the 3.79" crank or buy a 4.00" for this build. Like all of mine, it'll be a pump 93 deal, R1 block, 4.09" bore, ported Indy 360-1s, most likely T&D rockers, Indy intake and a yet to be decided solid roller.
Re: MP 3.79" cranks [Re: justinp61] #1794581
04/03/15 01:13 PM 04/03/15 01:13 PM
Joined: Nov 2004
Posts: 1,745
Maryland
340_Dart Offline
top fuel
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Posts: 1,745
Maryland
I'm following along to hopefully learn something here. Is the 1053 a steel weak compared to 4340? Whats a used crank of either steel worth? I'd like to eventually build a 3.79" motor one day.
Re: MP 3.79" cranks [Re: 340_Dart] #1794582
04/03/15 01:16 PM 04/03/15 01:16 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
Master

Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

I'm following along to hopefully learn something here. Is the 1053 a steel weak compared to 4340? Whats a used crank of either steel worth? I'd like to eventually build a 3.79" motor one day.



The billet cranks are made from 4340.. that might tell you
Re: MP 3.79" cranks [Re: justinp61] #1794583
04/03/15 01:26 PM 04/03/15 01:26 PM
Joined: Jan 2003
Posts: 4,448
Phoenix, AZ
M
MoparBilly Offline
master
MoparBilly  Offline
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M

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Posts: 4,448
Phoenix, AZ
Quote:

Now I need to decide if I want to run the 3.79" crank or buy a 4.00" for this build. Like all of mine, it'll be a pump 93 deal, R1 block, 4.09" bore, ported Indy 360-1s, most likely T&D rockers, Indy intake and a yet to be decided solid roller.



I faced the same dilemma a few years ago, decided to skip the 4.00, and go to the 4.125 to justify not using the 3.79.
It was the right decision!!

8479668-WHP1-Copy.jpg (249 downloads)
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