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Re: So how did this happen? [Re: ] #1564931
01/18/14 12:16 PM
01/18/14 12:16 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:

Quote:

Quote:

Don't know your setup, but torque straps to one of the mounting bosses is never a good idea.......

I don't get why the passenger side would be cracked also though....unless....do you have rigid straps on both sides ??




Where should they be attached? I never considered the motor mount boss wouldn't work given that's what point the factory used to hold the engine.




The original mounts were bolted to 3 points on each side....if u have rigid straps going to only one of the bosses.....that's where the problem lies imho




To me its the angle of how its loaded.. in other words
if you pull from the side of the block as in a torque
strap its not bad... but if you load from the front
of the engine as in engine limiters(limiting the
front/back movement) the load then applied to mount
ears is amplified by the 2" or so that the ears stick
out off the block and that would load the block 90*
to what it was originally designed for.... I load
the ears on my SB at a 45* angle which is 1/2 the load
on the block... but from what some are saying its
just a weak block

Re: So how did this happen? [Re: dogdays] #1564932
01/18/14 01:12 PM
01/18/14 01:12 PM
Joined: Jul 2005
Posts: 1,301
Penna
7
70satelliteguy Offline
pro stock
70satelliteguy  Offline
pro stock
7

Joined: Jul 2005
Posts: 1,301
Penna
"Dudes, you haven't lived enough. Those are VERY COMMON cracks. They aren't from freezing. They happened even at stock hp levels. They can be pinned"
Pull it out and have it pinned and welded
Mike

Re: So how did this happen? [Re: 70satelliteguy] #1564933
01/18/14 09:17 PM
01/18/14 09:17 PM
Joined: Apr 2007
Posts: 1,165
Central Ohio, USA
Bigbeep Offline
super stock
Bigbeep  Offline
super stock

Joined: Apr 2007
Posts: 1,165
Central Ohio, USA
I pinned mine last winter and it just moved where it would crack. Crack moved forward to the 1st and 2nd freeze plugs. I pinned it between the 2nd and 3rd. Also have a crack that runs vertical on the corner of the block on the #2 cylinder. That crack starts about a 1/2" below the top of the fill. I am cutting my loses with this block. I hate kicking money of the tailgate of my truck at the scrap yard and this got me about 6 races before cracking someplace else. Beep

Re: So how did this happen? [Re: Bigbeep] #1564934
01/18/14 10:22 PM
01/18/14 10:22 PM
Joined: Oct 2007
Posts: 480
templeton,ma
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coro500net Offline
mopar
coro500net  Offline
mopar
C

Joined: Oct 2007
Posts: 480
templeton,ma
Same issue on my 67 440,had it pinned and never a problem,and it is a street car.

Re: So how did this happen? [Re: Dart Racer] #1564935
01/18/14 11:57 PM
01/18/14 11:57 PM
Joined: Sep 2006
Posts: 1,443
central ohio
N
nss guy Offline
pro stock
nss guy  Offline
pro stock
N

Joined: Sep 2006
Posts: 1,443
central ohio
curious what the main cap webbing looks like..ie cracks, especially above #4 main.

Re: So how did this happen? [Re: nss guy] #1564936
01/19/14 01:41 AM
01/19/14 01:41 AM
Joined: Aug 2003
Posts: 43,284
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,284
Bend,OR USA
I've seen several(3+) RB, 440 and 426 M.W. with cracks between the #1 and # 3 cylinders from the bottom of the cylinders into the main webs


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: So how did this happen? [Re: ] #1564937
01/19/14 01:38 PM
01/19/14 01:38 PM
Joined: May 2003
Posts: 13,202
aZLiViN
J
J_BODY Offline
I Live Here
J_BODY  Offline
I Live Here
J

Joined: May 2003
Posts: 13,202
aZLiViN
I'm sure most are familiar with this, but here's a block without the "ribs" on the side.





...and here is the "added" material.



FWIW... I had a 69 block with the "ribs". No fill, motor plate used without a limiter for years, but later added one that attached to the 1/2" hole down near the pan rail (see pict 2). Never found any cracks, even had it checked before the last freshen (was on it's fourth...and waaayyy worn out!). Was putting down some decent power as it did run a few 9.9 passes.

Re: So how did this happen? [Re: nss guy] #1564938
01/19/14 06:29 PM
01/19/14 06:29 PM
Joined: Sep 2005
Posts: 570
Brea, Ca
D
Dart Racer Offline OP
mopar
Dart Racer  Offline OP
mopar
D

Joined: Sep 2005
Posts: 570
Brea, Ca
I'll post up when they get it apart if any cracks inside.

Re: So how did this happen? [Re: J_BODY] #1564939
01/19/14 06:29 PM
01/19/14 06:29 PM
Joined: Sep 2005
Posts: 570
Brea, Ca
D
Dart Racer Offline OP
mopar
Dart Racer  Offline OP
mopar
D

Joined: Sep 2005
Posts: 570
Brea, Ca
Just loooked and my block has the ribs.....

Re: So how did this happen? [Re: Dart Racer] #1564940
01/19/14 06:47 PM
01/19/14 06:47 PM
Joined: Sep 2005
Posts: 570
Brea, Ca
D
Dart Racer Offline OP
mopar
Dart Racer  Offline OP
mopar
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Joined: Sep 2005
Posts: 570
Brea, Ca
Couple have asked for photos. Got the engine out this morning.

Those who asked about how I was attaching the limiter bars you can see on the engine mount I made a plate to attach the bar to and the bar runs to the frame just before the radiator.






Re: So how did this happen? [Re: Dart Racer] #1564941
01/19/14 10:37 PM
01/19/14 10:37 PM
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem Offline
master
Dodgem  Offline
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Thats a later 68 block (probably a 69 model year) those stiffening ribs were supposed to help stop that cracking between the frost plugs common on the early 68 and older Big Blocks.

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