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Gen 3 Hemi vs. LA 340 weight?
#1687172
10/18/14 02:35 AM
10/18/14 02:35 AM
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Joined: Jun 2007
Posts: 2,432
NorCal
RylisPro
OP
top fuel
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OP
top fuel
Joined: Jun 2007
Posts: 2,432
NorCal
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Was doing some research and found the FABO thread http://www.forabodiesonly.com/mopar/archive/index.php/t-106670.htmlIt says Gen 3 Hemi's weigh 533 lbs. & LA 340's weigh 525 lbs. Is this fairly accurate? I would figure that the LA 340 weight is with iron heads and intake. My engine has alum. heads and intake though. Anyone know accurate weights on a Gen 3 Hemi and an alum. top end 340? Thanks 
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: RylisPro]
#1687173
10/18/14 02:41 AM
10/18/14 02:41 AM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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They are over 500 lbs. for sure. The blocks are freakin heavy!
Mopar to the bone!!!
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: RylisPro]
#1687176
10/18/14 10:33 AM
10/18/14 10:33 AM
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Joined: May 2005
Posts: 723
Houston Tx
Uhcoog1
super stock
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super stock
Joined: May 2005
Posts: 723
Houston Tx
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Bare 6.1 block on my scales is 190-195 lb.
So maybe 30 lb heavier than a 340 block and 30 lb lighter than a 440 block
I don't think you'll see much weight difference between the three when set up similarly.
The aluminum block is 75-100 lb less than the iron block. $4300. More bore available.
-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: 70blackfish]
#1687178
10/18/14 04:33 PM
10/18/14 04:33 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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Im not going to a Gen III for the weight break lol.
Mopar to the bone!!!
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: 72Swinger]
#1687179
10/18/14 05:02 PM
10/18/14 05:02 PM
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Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Quote:
Im not going to a Gen III for the weight break lol.
Me either, there are many...many other reasons to upgrade from an LA to a 3rd Gen. 
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: RylisPro]
#1687180
10/18/14 09:53 PM
10/18/14 09:53 PM
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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:
The Gen 3 Hemi 427 crate motors are (4.125 bore x 4.00 stroke) all aluminum.
Supposedly 100 lbs. less
Lets call it a 426. I dont care if its 1cid bigger... 427 is a Chevy/Ford engine.
190lb blocks? Christ. Things are supposed to get BETTER with technology... not worse. Who thought this one through in the design stages? You can find big block blocks that weigh that if you weigh a few...
I thought those new 7L hemis weren't available?
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: Pale_Roader]
#1687181
10/18/14 10:00 PM
10/18/14 10:00 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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Ill take a heavy block any day of the week that doesnt have cap walk and try to spit the crank out when you get towards 700hp.
Mopar to the bone!!!
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: GoodysGotaCuda]
#1687184
10/18/14 10:07 PM
10/18/14 10:07 PM
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Joined: Jun 2007
Posts: 2,432
NorCal
RylisPro
OP
top fuel
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OP
top fuel
Joined: Jun 2007
Posts: 2,432
NorCal
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Hey Goody do you have your car's weight before you pulled your LA small block? When you put in your Gen 3 and your T56 Magnum, please weigh your car. That's the real weight I want to know
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: RylisPro]
#1687185
10/18/14 11:08 PM
10/18/14 11:08 PM
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Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Quote:
Hey Goody do you have your car's weight before you pulled your LA small block?
When you put in your Gen 3 and your T56 Magnum, please weigh your car.
That's the real weight I want to know
I'll let you know. My iron headed/alum intake 318/904 weighed as follows. I'll be at least a year out on my swap.
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: 72Swinger]
#1687188
10/19/14 05:26 AM
10/19/14 05:26 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:
Ill take a heavy block any day of the week that doesnt have cap walk and try to spit the crank out when you get towards 700hp.
Ford's 20 year old 'Teksid' aluminum 4.6 block (96-99 Cobra) weighs about 90lbs, and is tried, tested and true to 1400HP. Their later ('01) domestic block was 5lbs lighter and still good for 1000 or 1200HP... i forget. They're already getting staggering numbers from the new 5.0 Coyote blocks. You can keep your 200lb block... whoever came up with that one is still livin' on 70's time...
I had no idea they were so heavy. Would have figured Dodge would have gone aluminum by now too? Even for iron... that seems overly heavy.
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: RylisPro]
#1687189
10/19/14 05:30 AM
10/19/14 05:30 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:
Do you happen to remember how much gas you had in the tank at the time?
Great info! 55/45 front rear at 3400 lbs. is pretty good for an E body!
Not bad at all. My bone stock survivor/stripper 70 6-cyl Challenger was 60/40 at 3000lbs...
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Re: Gen 3 Hemi vs. LA 340 weight?
[Re: Pale_Roader]
#1687190
10/19/14 09:04 AM
10/19/14 09:04 AM
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Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Quote:
Quote:
Ill take a heavy block any day of the week that doesnt have cap walk and try to spit the crank out when you get towards 700hp.
Ford's 20 year old 'Teksid' aluminum 4.6 block (96-99 Cobra) weighs about 90lbs, and is tried, tested and true to 1400HP. Their later ('01) domestic block was 5lbs lighter and still good for 1000 or 1200HP... i forget. They're already getting staggering numbers from the new 5.0 Coyote blocks. You can keep your 200lb block... whoever came up with that one is still livin' on 70's time...
I had no idea they were so heavy. Would have figured Dodge would have gone aluminum by now too? Even for iron... that seems overly heavy.
I agree, production high hp aluminum blocks are out there for Ford and Chevy. Typical Mopar is always behind in some form or fashion...Unfortunately it's the best thing we have going at the moment.
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