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Re: 76 HP 440 6 pack
[Re: mopglen]
#1335322
11/14/12 08:53 PM
11/14/12 08:53 PM
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Joined: Dec 2005
Posts: 1,157
Cruising!
QuickDodge
super stock
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super stock
Joined: Dec 2005
Posts: 1,157
Cruising!
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Does this engine have a six pack intake on it, or does it just have the six pack bottom end?
It seems like the six pack bottom ends were used on a few 4 bbl carb models after 1972. I could be mistaken on this point though.
Last edited by QuickDodge; 11/14/12 08:53 PM.
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Re: 76 HP 440 6 pack
[Re: mopglen]
#1335323
11/14/12 08:56 PM
11/14/12 08:56 PM
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Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
DPelletier
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
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For the record: "Six Pack Rods" , ( part number 2951906, casting # 2951908 ) were not used only on 440-6 motors; in fact they were used from 1970 - 1975 on all forged crank HP motors and truck motors. The idea that these rods are found on only 440-6's is a common and pervasive urban myth.
I'm sure Chrysler marine used the HD truck stuff.
Another thought; these rods are indeed heavier than "LY" rods but they were introduced after unacceptable warranty claims arose from the '69 model year. Many experts have said that these rods are superior to the LY's despite the retention of the 3/8" rod bolts. In any case, I believe that a lighter reciprocating assy using hi quality rod bolts, 906 rods and modern lightweight forged pistons is actually a pretty stout setup. I'd much rather save weight on the (ridiculously heavy) stock TRW slugs than I would on the rods.
...of course these days, there are plenty of aftermarket rods that are both lighter AND stronger, but I still say the 906's get a bad rap that isn't particularly deserved.
Dave
Last edited by DPelletier; 11/15/12 01:25 PM.
1970 Super Bee 440 Six Pack
1974 'Cuda
2008 Ram 3500 Diesel
2006 Ram 3500 Diesel
2004.5 Ram 2500 Diesel
2003 Ram 3500 Diesel
2006 Durango Limited
[url] http://1970superbee.piczo.com [/url]
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Re: 76 HP 440 6 pack
[Re: DPelletier]
#1335329
11/15/12 08:07 AM
11/15/12 08:07 AM
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Joined: Nov 2003
Posts: 12,494
Western Colorado High Desert
moparmarks
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 12,494
Western Colorado High Desert
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Quote:
For the record: "Six Pack Rods" , ( part number 2951906, casting # 2951908 ) were not used only on 440-6 motors; in fact they were used from 1970 - 1975 on all forged crank HP motors and truck motors. The idea that these rods are found on only 440-6's is a common and pervasive urban myth.
I'm sure Chrysler marine used the HD truck stuff.
Dave
Actually I've found 6-pack rods all the way through 78 in trucks and MH's
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/motormangj@gmail.com
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Re: 76 HP 440 6 pack
[Re: DPelletier]
#1335330
11/15/12 09:44 AM
11/15/12 09:44 AM
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Joined: Jan 2005
Posts: 4,862
the frozen wastes...
Pale_Roader
Swears too much
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Swears too much
Joined: Jan 2005
Posts: 4,862
the frozen wastes...
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Quote:
For the record: "Six Pack Rods" , ( part number 2951906, casting # 2951908 ) were not used only on 440-6 motors; in fact they were used from 1970 - 1975 on all forged crank HP motors and truck motors. The idea that these rods are found on only 440-6's is a common and pervasive urban myth.
I'm sure Chrysler marine used the HD truck stuff.
Another thought; these rods are indeed heavier than "LY" rods but they were introduced after unacceptable warranty claims arose from the '69 model year. Many experts have said that these rods are superior to the LY's despite the retention of the 5/16 rod bolts. In any case, I believe that a lighter reciprocating assy using hi quality rod bolts, 906 rods and modern lightweight forged pistons is actually a pretty stout setup. I'd much rather save weight on the (ridiculously heavy) stock TRW slugs than I would on the rods.
...of course these days, there are plenty of aftermarket rods that are both lighter AND stronger, but I still say the 906's get a bad rap that isn't particularly deserved.
Dave
So yet another reason for the performance drop after 69-70...???
I was always under the impression it was 72 and up, and not all 440's, just a random majority. I've seen more than one 71-4 steel crank 440's with an internal balancer. Wouldn't all the 6-pack rod 440's been external...???
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Re: 76 HP 440 6 pack
[Re: Pale_Roader]
#1335332
11/15/12 10:52 AM
11/15/12 10:52 AM
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Joined: Jan 2003
Posts: 2,734
Charlotte, NC
446acuda
master
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master
Joined: Jan 2003
Posts: 2,734
Charlotte, NC
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Quote:
So yet another reason for the performance drop after 69-70...???
I was always under the impression it was 72 and up, and not all 440's, just a random majority. I've seen more than one 71-4 steel crank 440's with an internal balancer. Wouldn't all the 6-pack rod 440's been external...???
When the compression ratio dropped in '72 or so the pistons got light enough to internally balance a 6 pak rod motor. The imbalance was only 6.5 in-oz(compared to cast crank LY rod 440 at 12.9 in-oz) so it didn't take much weight reduction to go to internal balance.
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Re: 76 HP 440 6 pack
[Re: 446acuda]
#1335333
11/15/12 12:02 PM
11/15/12 12:02 PM
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Joined: Dec 2003
Posts: 2,042
Leucadia, Ca.
vdriver
top fuel
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top fuel
Joined: Dec 2003
Posts: 2,042
Leucadia, Ca.
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Quote:
I know that a lot of the big '73-4 motorhomes had steel cranks, 6 pak rods, double roller timing chains, '213 heads and windage trays and were internally balanced.
 I've pulled probably a half dozen of these out of motorhomes & trucks over the last 5 years. 
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Re: 76 HP 440 6 pack
[Re: Pale_Roader]
#1335335
11/15/12 01:24 PM
11/15/12 01:24 PM
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Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
DPelletier
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
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Quote:
Quote:
For the record: "Six Pack Rods" , ( part number 2951906, casting # 2951908 ) were not used only on 440-6 motors; in fact they were used from 1970 - 1975 on all forged crank HP motors and truck motors. The idea that these rods are found on only 440-6's is a common and pervasive urban myth.
I'm sure Chrysler marine used the HD truck stuff.
Another thought; these rods are indeed heavier than "LY" rods but they were introduced after unacceptable warranty claims arose from the '69 model year. Many experts have said that these rods are superior to the LY's despite the retention of the 5/16 rod bolts. In any case, I believe that a lighter reciprocating assy using hi quality rod bolts, 906 rods and modern lightweight forged pistons is actually a pretty stout setup. I'd much rather save weight on the (ridiculously heavy) stock TRW slugs than I would on the rods.
...of course these days, there are plenty of aftermarket rods that are both lighter AND stronger, but I still say the 906's get a bad rap that isn't particularly deserved.
Dave
So yet another reason for the performance drop after 69-70...???
I was always under the impression it was 72 and up, and not all 440's, just a random majority. I've seen more than one 71-4 steel crank 440's with an internal balancer. Wouldn't all the 6-pack rod 440's been external...???
No. like 446acuda stated, later motors used "six pack" rods and were internally balanced. Not sure what you mean by "performance drop after 69-70"; 69's used LY rods and '70 and up HP used "six pack" rods. 
Here for everyone's reading pleasure:
http://www.440source.com/stockrods.htm
and
http://www.440source.com/dampers.htm
Dave
1970 Super Bee 440 Six Pack
1974 'Cuda
2008 Ram 3500 Diesel
2006 Ram 3500 Diesel
2004.5 Ram 2500 Diesel
2003 Ram 3500 Diesel
2006 Durango Limited
[url] http://1970superbee.piczo.com [/url]
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Re: 76 HP 440 6 pack
[Re: buildanother]
#1335336
11/15/12 01:26 PM
11/15/12 01:26 PM
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Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
DPelletier
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
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Quote:
3/8" on the factory rod bolts.
Thanks
Yes, sorry; meant they retained the 3/8" rod bolts rather than upsizing to the Hemi's 7/16's when they designed the "six pack" rods.
Dave
1970 Super Bee 440 Six Pack
1974 'Cuda
2008 Ram 3500 Diesel
2006 Ram 3500 Diesel
2004.5 Ram 2500 Diesel
2003 Ram 3500 Diesel
2006 Durango Limited
[url] http://1970superbee.piczo.com [/url]
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