Why?

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Sparky said:
Just wondering,has anyone put a fuel injection set up on their late sixties 340?
If so, was the cost worth the benefits? and does it add significantly to the performance?
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EFI does not improve performance (unless your carb is way way out of tune). what it does do is improve drivability and mpg.


total costs are in the 3-4000 dollar range if you are doing it the right way. the kits are in the $2000 range then you need all the little crap and the big thing is the fuel system. adds up fast..
 
Ever heard of exageration to make a point?

Boy I'm all piss and vinegar in this thread.

Anyway I got the guy to admit he doesn't know the HP on the motor that was claimed to be 350 NET.

(No offense)

Cause I really wanted that recipe!
 
EFI also improves effeciency and longevity.

Just sayin'
 
A lot of good points made by many others but here is a big one.

A stock 5.7 Head from 2003-3009 flows around 280 CFM, this is as much as an unported W race head. Ported 6.1 Heads flow over 350 CFM. These are huge numbers with relatively small ports that allow big HP numbers with relatively mild cam shafts. A stock 5.7 Head, a head designed to feed 345 cubic inches flows more than a fully ported 440 906 head.

A 6.1L Hemi with a cam with .550 lift, a set of headers, and a good tune puts out 500HP at the flywheel. This is out of 372 cubic inches. 25 years ago a 500 HP small block was a beast, saying you had 400 HP was a big deal. Today with a Gen III Hemi if you're not making 400-500 HP you're simply not trying. Hell a trained chimp could get 500 HP out of a Gen III Hemi.

Regards,

Joe Dokes
 
Why would I do it? Because they are in production and therefore cheap. As soon as the magnum ceased production, the MP crate motors doubled in price, but now you can buy a carb conversion 5.7hemi for what, 6k? Compared to 11k
 
abodyjoe said:
not sure about a stock k-frame car. but in my dart a LS motor would be probably half the price.

can get an alumn LS with OD trans for around $3K. just have to get the proper mounts (and weld on brackets) from rms to be able to bolt the LS on to my alter-k. a $400 set of camaro headers will fit with the alter-k instead of a $1000 set of tti headers. computer set is about $1800 and i know a guy that will plug a tune into it.. up to this point yes its about 6-700 dollars cheaper for the LS. where the big money is saved is the OD trans i got with the motor. in a mopar you are looking at $3K on top of the engine swap to do a OD trans..


the after market for a LS motor is just an added bonus...
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Hemi header options:
TTI- $740 (not $1000)
Hooker- $550
Jeep srt8- $150

Computer and wiring- $1000-$1800

T56 and tko600's both bolt right up.

I don't see the price differential you're talking about.
 
HUM--crossed bolted mains-no stroke clearancing-huge head ports-528 rwhp ??? Give me the recipe to do that with a 360 block???? that's 528 rwhp not crank hp.
 
cost to build a 600 crank hp with a 360 block--if someone knows the figures-Steve
 
Uhcoog1 said:
Hemi header options:
TTI- $740 (not $1000)
Hooker- $550
Jeep srt8- $150

Computer and wiring- $1000-$1800

T56 and tko600's both bolt right up.

I don't see the price differential you're talking about.
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I'm talking automatic od.

Ls will still be cheaper in the long run. And also have tons more aftermarket support. Those are the facts.
 
abodyjoe said:
I'm talking automatic od.

Ls will still be cheaper in the long run. And also have tons more aftermarket support. Those are the facts.
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In the long run? Whatever does that mean? Same valve springs, same rebuild costs, same camshaft costs, etc.

Anybody know what overdrive options there are for hemi's? Or small block LA's? I know a few (including the 4l60e), but I don't know pricing.
 
some good points made about the 6.1 vs BB or LA

however, given the added expenses, is it cost effective?

even if it was only $1000 (it's way more) how much more power could you get out of the others?

or if you put efi / good heads (not iron stockers) and other things to make the cost even which would put you down the 1/4 faster? about the only thing I see advantage wise is fuel economy... maybe. that's if you keep your foot out of it. those mid 20's mpg numbers that were quoted for the newer mopars is if you feather the gas pedal lol.

again when I mentioned valve train maintenance for the new hemi's in race cars was what I said... for race cars. big lift, high HP they tend to have valve train / short block issues if you go on the high side. not talking 400-500hp.
 
Uhcoog1 said:
In the long run? Whatever does that mean? Same valve springs, same rebuild costs, same camshaft costs, etc.

Anybody know what overdrive options there are for hemi's? Or small block LA's? I know a few (including the 4l60e), but I don't know pricing.
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In the long run meaning when the swap is complete the ls and automatic od is cheaper then a modern Hemi and automatic od again im talking about installing one in my car with a rms suspension where i can use a cheap off the shelf header. Not really up on prices of the 5 and 6 speeds. Have heard of picking up a viper trans for 1000-1500 dollars though.

As for od options for Hemi or la ya have the 500,518, guess you could use a challenger trans,gear vendors, GM 200r, GM 700r the one you listed and there is even a kit for a ford aod out there. The expense come when using a non mopar trans is the adapter kits. Some are $800. Gear vendors is close to 3k.

All of those transmissions also need the torsion bar crossmember cut and modified which some guys don't want to do.
 
Abodyjoe please tell me your not going to put a Chevy motor in a Mopar??? Its your car but why???
 
It may come to that down the road

Why? Already stated why. Price and aftermarket support are the biggest reasons.
 
In my opinion, the only advantage the LSx swap would provide is an easy OD auto trans. That's it. I think we're saying the same thing, just for your application (stock 4l60e), it's the most important thing that matters to you.

You keep talking about 'more aftermarket support'; sure, there is way more aftermarket LSx products and companies. However, there is tons of Hemi aftermarket support as well. And the pricing is comparable. An LSx dart is more or less one off, so you'll have little aftermarket support for external engine stuff.
 
:mrgreen:I like the ls engine platform. Would it be cheaper? I am not sure. If you are just starting the build the car and you need to fab engine and trans mounts or have someone do it for you or buy the RMS suspension with ls mounts then buying the RMS suspension with the Hemi mounts or TTI kit. The LS has been around since 98 so ya the aftermarket is larger even though the hemi after market is growing, but lets face it Chevy has always had a larger aftermarket then mopar. As for AOD trans I guess it depends on what your doing with the car, does the chev trans fit without modifying the floor? Either way a mount needs to be fabricated. Looking for lots of power and good fuel economy turbo and 3.23 gears and a 3 speed.😁
 
An LSx dart is more or less one off, so you'll have little aftermarket support for external engine stuff.
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such as what? the LS power steering pump will work better with my rack then the hemi pump will. headers ar an off the shelf part. from quick measurements it looked like the accessories will actually fit better between the frame rails then a hemi would.. that would have to be verified though.

sure, there is way more aftermarket LSx products and companies.
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exactly what i said.
 
swifter said:
why not put a 518 behind a gen 3 Hemi ?????
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i listed that as an option.

if i'm going all computer controlled efi i may as well go computer controlled trans too. make it shift like i want and change shift points without ever dropping the pan.
 
You can probably figure out off the shelf headers, and an off the shelf pan (hopefully you won't need to do any work for fitment). Your engine mount and tranny mount will be one off. My point is you'll have to figure it out on your own, as there isn't anyone to tell you "this definitely works."
 
I'm all for hot rodding, using parts that are different, and making things work. I'll be impressed if you put an LSx in your car and do it all yourself. Just let me know when you start a thread, and I'll subscribe.
 
camaro off the shelf headers fit (forget what year but thats just a phone call away)

oil pan again isn't a problem.. if i remember it was a factory pan. (again just a phone call away)

engine mounts are or will be available soon from RMS. bill is gonna make them because so many guys called asking if he offered them the last couple of years.

trans mount has to be custom no matter what OD trans you use except for a stock mopar OD 4 speed or one of passons units, but being an original automatic car i'll have to cut for any manual trans too... no way around that. some require more cutting than others.

not much to figure out on my own. they are out there already. maybe not on this site or a place like moparts but they are out there. all my information for bolting it in is a phone call to RMS away. electronics info is out there all over the place.

i was at RMS early this year i think it was and saw the LS1 and OD automatic trans they got for 3K. they took a few quick measurements and some things actually look like they will fit better then the hemi. something was narrower. would have to find out for sure what it was. the hemi power steering pump puts some stupid kinds of pressure out that is a pain in the *** with my rack. the gm pump puts a normal pressure out so its a hook it up and go deal..
 
Uhcoog1 said:
I'm all for hot rodding, using parts that are different, and making things work. I'll be impressed if you put an LSx in your car and do it all yourself. Just let me know when you start a thread, and I'll subscribe.
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**** they would probably ban me..lol
 
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