2 different 440's why?
#1413737
04/02/13 03:47 PM
04/02/13 03:47 PM
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Tenn
tdenkler
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Tenn
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How to make someone get a headache! Gentlemen! Greetings! You would thing after eleventy billion years of being a mopar nut I would know this. I'm clueless! What is the difference between the K 440 350 horse and the L 440 375 horse. This started back in 59 with 413 340 horse and 413 360 horse. Supposedly cams are the same, same intake, where does the extra 25 horses come from! Tom Denkler tdenkler3853@earthlink.net
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Re: 2 different 440's why?
[Re: 6bblgt]
#1413740
04/02/13 03:59 PM
04/02/13 03:59 PM
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Joined: Jul 2008
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Florida STAYcation
dOoC
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The village idiot's idiot
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 add windage tray & valve springs
YES ...indeedy !
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Re: 2 different 440's why?
[Re: Cab_Burge]
#1413742
04/02/13 04:21 PM
04/02/13 04:21 PM
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Joined: Jan 2003
Posts: 17,518
Las Vegas, NV
6bblgt
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Quote:
The 1967 HP 440, 375 HP and later got different intake manifold, bigger carb and probally a higher compression ratio pistons and better cam, lifters and rocker arms and pushrods.  Maybe not on the rocker arms and pushrods until the 390 HP six pak motors came out in 1969  The low po 440 had Holley carbs, the flat intake manifolds like the 413 and street 426 Wedges had and smaller AFB if the motor came with AFB instead of the later model Holleys like that where on them in 1968
different intake manifold, higher compression ratio pistons - not true  (until the 6bbl made many additional differences)
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Re: 2 different 440's why?
[Re: 6bblgt]
#1413743
04/02/13 05:07 PM
04/02/13 05:07 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
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The 1967 HP 440, 375 HP and later got different intake manifold, bigger carb and probally a higher compression ratio pistons and better cam, lifters and rocker arms and pushrods. Maybe not on the rocker arms and pushrods until the 390 HP six pak motors came out in 1969 The low po 440 had Holley carbs, the flat intake manifolds like the 413 and street 426 Wedges had and smaller AFB if the motor came with AFB instead of the later model Holleys like that where on them in 1968
different intake manifold, higher compression ratio pistons - not true (until the 6bbl made many additional differences)
Pistons were always the same across the board on 440's, with the exception of the 70-71 6 packs. The 69.5's ran the regular 440 pistons.
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Re: 2 different 440's why?
[Re: DaytonaTurbo]
#1413747
04/03/13 10:45 AM
04/03/13 10:45 AM
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Indiana
Fury Fan
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Quote:
Pistons were always the same across the board on 440's, with the exception of the 70-71 6 packs. The 69.5's ran the regular 440 pistons.
Ah, then the 70-71 375hp version had those exception pistons also, as the engine was same as the 6-pack except for induction.
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Re: 2 different 440's why?
[Re: Fury Fan]
#1413749
04/03/13 01:01 PM
04/03/13 01:01 PM
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Joined: Jan 2003
Posts: 75,060
U.S.S.A.
JohnRR
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Quote:
Quote:
Pistons were always the same across the board on 440's, with the exception of the 70-71 6 packs. The 69.5's ran the regular 440 pistons.
Ah, then the 70-71 375hp version had those exception pistons also, as the engine was same as the 6-pack except for induction.
Incorrect , 70-71 375HP motors were rated at a lower compression ratio as the 6pk and didn't have pistons with 4 valve reliefs , only the 6pk engine had those.
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Re: 2 different 440's why?
[Re: JohnRR]
#1413750
04/03/13 01:57 PM
04/03/13 01:57 PM
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Posts: 9,436
Blair County,PA
62maxwgn
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Quote:
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Pistons were always the same across the board on 440's, with the exception of the 70-71 6 packs. The 69.5's ran the regular 440 pistons.
Ah, then the 70-71 375hp version had those exception pistons also, as the engine was same as the 6-pack except for induction.
Incorrect , 70-71 375HP motors were rated at a lower compression ratio as the 6pk and didn't have pistons with 4 valve reliefs , only the 6pk engine had those.
And I "THINK" the 71 6pk motor was rated with a slightly lower compression ratio than the 70.I'm "sure" someone will correct me if I'm wrong !! 
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Re: 2 different 440's why?
[Re: JohnRR]
#1413751
04/03/13 02:42 PM
04/03/13 02:42 PM
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Joined: Mar 2003
Posts: 18,678
Fresno, CA
Jim_Lusk
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Quote:
Also the curve on the distributor was a little different.
But to answer the question as to WHY 2 different 440's .... more HP ...
And, different torque curve. In a heavy C-body most buyers wanted the lower RPM for the peak torque, which the smaller cam and carb would provide. Probably slightly better fuel economy (economy might not be the correct word when it comes to a 440 C-body...).
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Re: 2 different 440's why?
[Re: 62maxwgn]
#1413752
04/03/13 03:23 PM
04/03/13 03:23 PM
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Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
DPelletier
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Pistons were always the same across the board on 440's, with the exception of the 70-71 6 packs. The 69.5's ran the regular 440 pistons.
Ah, then the 70-71 375hp version had those exception pistons also, as the engine was same as the 6-pack except for induction.
Incorrect , 70-71 375HP motors were rated at a lower compression ratio as the 6pk and didn't have pistons with 4 valve reliefs , only the 6pk engine had those.
And I "THINK" the 71 6pk motor was rated with a slightly lower compression ratio than the 70.I'm "sure" someone will correct me if I'm wrong !!
You're not wrong; 1970 10.5:1, 390hp; 1971 10.3:1, 385hp.
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: 2 different 440's why?
[Re: DPelletier]
#1413753
04/03/13 04:31 PM
04/03/13 04:31 PM
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Anonymous
Unregistered
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Anonymous
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You all have spent all this time on pistons and other stuff, but the assumption in the original post - that they have the same cam - is wrong.
The 340 hp and 360 hp 413's didn't have the same cam, and the 350 and 375 hp 440's also didn't have the same cam. In both cases, the higher horsepower versions had a hotter cam. And the 440/375 cam was hotter than the 413/360.
There are also some higher performance 413's that had a hotter cam than the 413/360. The are the short-long ram 390/400/405 hp 413's in Chryslers and of course the max wedges in B bodies.
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Re: 2 different 440's why?
[Re: DPelletier]
#1413754
04/03/13 06:04 PM
04/03/13 06:04 PM
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Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn
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Quote:
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Pistons were always the same across the board on 440's, with the exception of the 70-71 6 packs. The 69.5's ran the regular 440 pistons.
Ah, then the 70-71 375hp version had those exception pistons also, as the engine was same as the 6-pack except for induction.
Incorrect , 70-71 375HP motors were rated at a lower compression ratio as the 6pk and didn't have pistons with 4 valve reliefs , only the 6pk engine had those.
And I "THINK" the 71 6pk motor was rated with a slightly lower compression ratio than the 70.I'm "sure" someone will correct me if I'm wrong !!
You're not wrong; 1970 10.5:1, 390hp; 1971 10.3:1, 385hp.
Dave
Thank you David!!! 
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