Posted By: RylisPro
Gen 3 Hemi vs. LA 340 weight? - 10/18/14 06:35 AM
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
Posted By: 72Swinger
Re: Gen 3 Hemi vs. LA 340 weight? - 10/18/14 06:41 AM
They are over 500 lbs. for sure. The blocks are freakin heavy!
Posted By: Pale_Roader
Re: Gen 3 Hemi vs. LA 340 weight? - 10/18/14 10:53 AM
Are ANY ov the new hemis all aluminum? Aluminum blocks seem no big deal for Ford, but Dodge... who sure could use a weight break, sticks with iron?
Posted By: RylisPro
Re: Gen 3 Hemi vs. LA 340 weight? - 10/18/14 12:48 PM
The Gen 3 Hemi 427 crate motors are (4.125 bore x 4.00 stroke) all aluminum.
Supposedly 100 lbs. less
Posted By: Uhcoog1
Re: Gen 3 Hemi vs. LA 340 weight? - 10/18/14 02:33 PM
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.
Posted By: 70blackfish
Re: Gen 3 Hemi vs. LA 340 weight? - 10/18/14 07:40 PM
my friends all alum. 6.1 really a 7.0 is 425lbs
Posted By: 72Swinger
Re: Gen 3 Hemi vs. LA 340 weight? - 10/18/14 08:33 PM
Im not going to a Gen III for the weight break lol.
Posted By: 72Swinger
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 02:00 AM
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.
Posted By: RylisPro
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 02:02 AM
Actually its more of a 428 (CID= 427.65)
They are available if you have $15,000.00 and that is with Compstar H-beam con rods
Posted By: GoodysGotaCuda
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 02:03 AM
I have a '06 5.7 block here that I can pop the crank out of and weigh it if the need is there.
Posted By: RylisPro
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 02:07 AM
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
Posted By: RylisPro
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 03:18 AM
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!
Posted By: GoodysGotaCuda
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 03:31 AM
I had 13gal or so in the tank. I'm also adding A/C to the car.
Posted By: RylisPro
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 01:18 PM
I am just grateful that they have aluminum Gen 3 blocks at all. I would love to lose 75-80 lbs. off the front end to balance out the car. I really feel that with our crap +40 year old chassis that you can't really utilize more than 500hp cornering at the track anyways.
Posted By: RylisPro
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 02:39 PM
With the "crap chassis" I meant was how it was put together at the factory compared to today's standards which I assume would have better quality control. My cage builder said it was the worst car he's ever worked on as nothing really lined up body wise. He said there were 1 inch differences left vs. right.
My car must have been built on a Friday haha!
Posted By: 72Swinger
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 07:26 PM
So when you add all the power adders that are required to make Ford 4.6 worth 2 S$$t's how much does it weigh? No advantage to those engines whatsoever.
Posted By: Kern Dog
Re: Gen 3 Hemi vs. LA 340 weight? - 10/19/14 08:13 PM
Mopar Action magazine had a bit where they spoke with a 3G engineer. They had plans to build the 5.7 from aluminum but found that cast iron suited the needs better in terms of long term durability. Remember, the "Coyote" engine didn't get installed in the F-150 for 300,000 mile durability.
The 5.7 Hemi was expected to be a long lasting engine in the same vein as the Slant six and 318. I say "mission accomplished". My 2007 has 210,000 and still idles and runs like new. It burns some oil but is otherwise solid as a rock. I can only imagine how an aluminum block would have failed after the stresses of towing, running in 110 degree heat and 200,000 + miles of use. Look at the Cummins Diesel engines. THOSE are as heavy as you could ever imagine, again for durability and longevity. Granted, the high compression and vibration of Diesel engines impart greater stress, but you get the idea, right?
Posted By: 72Swinger
Re: Gen 3 Hemi vs. LA 340 weight? - 10/20/14 11:18 AM
I got into the 11's with 365 rwhp. So what that it was with a $3000 station wagon motor. We could go on for days about cheap and fast this and that. I do it my way because it isnt like other people and doesnt follow the masses. I cant wait to get my over weight Gen III HEME running.
Posted By: 72Swinger
Re: Gen 3 Hemi vs. LA 340 weight? - 10/20/14 08:19 PM
Never dynoed it, it went 11.96 at 112 weighing 3420 at 2300ft.