5.7 HEMI Vs. 408 Stroker

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dgc333 said:
Why not stroke a new Hemi? There are all sorts of stroker kits out there for the new hemi now. The more popular stroker kits give you 392 cid or 426 cid of displacement.

The one question no one has asked is why not stick with the 360? The 360 is a great motor in an A-body very easy to get over 400HP and 400 ft-lbs of torque, they will get decent gas mileage if set up correctly and can push you car into the 12's with little effort.

If I were you and was looking to make a hot daily driver I would stick with your low mileage 360 and put some sort of OD tranny behind it.

Oh Yea, I am you!! Already did that :)

I have a 360 that is making ~370 HP gets 17-18 mpg in daily driving and 21-22 on the hiway. I have run a very very traction limited best of 13.7 in the 1/4 with an A833OD 4spd and 3.55 gears. Its in a 68 Barracuda and the car has been my daily driver from April to November since 2000 and has had the 360 in it since 2005 (23k miles so far).

The 408 would be nice but I don't know if the fun factor would go up enough to warrant the hit in gas mileage.
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Good points, but if you go with EFI, you could dial back the fuel curve to commuter levels then when you want to get on the loud pedal more power is just a click away. There's no way a carb can compete with FI for economy assuming that's part of your equation.

Some sort of OD would also increase mileage, definitely. An A-518 might work too if you already have an auto in there, but I think it may require some floor surgery.
 
EFI is definately the way to go for economy but I wonder if the cost of EFI will ever be recouped in gas savings.

A well sorted out carb can get awful close to EFI numbers in regards to economy.
 
360's are ok...strokers are much more fun,i own both so i know firsthand...
 
has anyone heard about a new gen aluminum block hemi? i know a few web-sites are advertising them for about $9000 but has there been any Mopar news?
 
dgc333 said:
Why not stroke a new Hemi? There are all sorts of stroker kits out there for the new hemi now. The more popular stroker kits give you 392 cid or 426 cid of displacement.

The one question no one has asked is why not stick with the 360? The 360 is a great motor in an A-body very easy to get over 400HP and 400 ft-lbs of torque, they will get decent gas mileage if set up correctly and can push you car into the 12's with little effort.

If I were you and was looking to make a hot daily driver I would stick with your low mileage 360 and put some sort of OD tranny behind it.

Oh Yea, I am you!! Already did that :)

I have a 360 that is making ~370 HP gets 17-18 mpg in daily driving and 21-22 on the hiway. I have run a very very traction limited best of 13.7 in the 1/4 with an A833OD 4spd and 3.55 gears. Its in a 68 Barracuda and the car has been my daily driver from April to November since 2000 and has had the 360 in it since 2005 (23k miles so far).

The 408 would be nice but I don't know if the fun factor would go up enough to warrant the hit in gas mileage.
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21-22 on the hiwy with a 360/3.55s/4-spd!? Wow, are you sure you measured correctly? I can't beat 16 mpg with mine and I have a very similar setup, but make a bit less HP and run 3.23s.

~Bill
 
The 4spd is an overdrive unit, I am only turning a tick over 2000 rpm at 70 mph. I tried a bunch of different carbs. The Holley 3310 750 got about 16-17 on the hiway. The Holley 670 Street Avenger I am using now picked up 5 mpg.
 
dgc333 said:
The 4spd is an overdrive unit, I am only turning a tick over 2000 rpm at 70 mph. I tried a bunch of different carbs. The Holley 3310 750 got about 16-17 on the hiway. The Holley 670 Street Avenger I am using now picked up 5 mpg.
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OIC ... FWIW I run a B/G RD 625. the 4spd is mnl
 
evey thing you need to do to put in a 5.7 startes at 500$ oil pan 500 intake 500$ an the list grows on if you let it be efi fast engineering 2500 for wiring an control box . getting ready to do one for a friend we will see if he is still friend after finished lol
 
Assuming the motors yield similar power, consider the cost and the hassle of either. My Setup:
408 cast crank stroker from Hughes - 9.9:1 compression (too low!)
87 Octane street, 93 Octane strip
mild port/polish on Edelbrock al perf heads, closed chamber, fresh valve job
M1 single plane airgap with gasket match (heads too)
Street - Edel 1406 600 cfm carb, vacuum secondaries
Strip - Holley 750 with proform center
Comp roller .544/.541 236/242 110 centerline
FBO ignition, ditributor curved to 16 inital, 34 total @ 2900 rpm
Hooker comp 1 5/8" headers (dented bottoms on driver side, naturally) 3" collector
2.5" pipe to flowmasters into 2" pipe (looks to be OE) into a-body tips
3000 stall TCI streetmaster - 727 manual reverse
3.73 Dana into 28" slicks for strip, 28" street radials

My best time at strip with the Holley, Slicks and open headers is 12.35. On the highway, with the 28" radials and the Edel 600, I can get ~14 mpg at 67 mph, tacking right at 3000. There is probably more in the motor as it is, but I am somewhat happy for now. Oh, and BTW, the car is very streetable, and pulls away from the light with no stumble surge or issues. A great driver, and fun. Incidentally, to stroke the 360 and drop in in place of the 340 required NO modification to the frame, body, tranny tunnel, or anything else. On that basis alone, I would vote 408 Stroker.
 
dartman340ta said:
evey thing you need to do to put in a 5.7 startes at 500$ oil pan 500 intake 500$ an the list grows on if you let it be efi fast engineering 2500 for wiring an control box . getting ready to do one for a friend we will see if he is still friend after finished lol
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It would be cool to know how much was invested after everything is said and done.


A EFInjected 408 would be killer. The motor would have each of both worlds then. LOL
 
deep pockets ..... every thing ive found starts around 500$ oil pan ,intake to name a few fast makes a program an controller for around 2500 thats with the wiring harness . use the truck manifolds they breath better . i seen the other day in one of the rags that there making mounts for them now too . a friend an i had this thought for a while now in his 70 dart swinger .then it went to his 70 coronet . when he makes up his mine we will stick one in. we already have 2 of them . to be honest i would do a 6.1 instead or a viper motor
 
dartman340ta said:
deep pockets ..... every thing ive found starts around 500$ oil pan ,intake to name a few fast makes a program an controller for around 2500 thats with the wiring harness . use the truck manifolds they breath better . i seen the other day in one of the rags that there making mounts for them now too . a friend an i had this thought for a while now in his 70 dart swinger .then it went to his 70 coronet . when he makes up his mine we will stick one in. we already have 2 of them . to be honest i would do a 6.1 instead or a viper motor
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Yeah, a 6.1 in an A-body would get maybe 1-2 MPG less but would be fast as HELL. 12-second 1/4-mile no sweat!
 
I'm a bit biased though. I just scored a nice 5.7. I still need to get the wire harness and computer controller but the price I got the engine for makes up for it. It's going to cost more for headers but it's worth it in the end for me and what I'm doing.
 
wacuda here you go should be enough to keep you reading for a while.
1 and 2 are 5 spd manual kits
3 is the new hemi stroker kits ,
4 hemi6 box ,
5 carb conversion kit which includes the hemi6 box ,
6 is a tech articles on A body with new hemi swap allready done by magazine.
7 is a magazine write up with dyno results from installing the xvmotorsports kit from #5

enjoy duke :)

http://www.keislerauto.com/index.php?/wizard.html?starterMake=mopar

http://www.classicmopar5speed.com/1967-76-A-Body-Kit-Select.aspx

http://www.indyheads.com/newhemi.html

http://store.summitracing.com/partdetail.asp?part=msd-6013&view=1&N=700+

http://www.xvmotorsports.com/products/category/index.cfm?cid=120&lvl=1

http://www.hotrod.com/howto/hrdp_0706_hemi_swap/index.html

http://www.popularhotrodding.com/tech/0803phr_57l_hemi_engine_build/index1.html
 
all this stuff for sale is advertised in www.moparmusclemagazine.com

i took some time to actually read all the adds and look up some websites .

probably doesnt need said but i am a big fan of that magazine.

good luck which ever way you decide to go. hemi or 408 stroker honestly i would be happy with either of them in my ride. they both have very strong selling points. if you are like me your wallet makes alot of decisions for you lol

good luck
duke :)
 
Just finished my 68' Dart 6.1 Hemi - I highly recommend the 408 small block!

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gocirino said:
Just finished my 68' Dart 6.1 Hemi - I highly recommend the 408 small block!
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LOL.. That is why I said what I said. Wicked car, and really cool job. But "bolt it in" is a stretch... in both effort and wallet.
 
moper said:
LOL.. That is why I said what I said. Wicked car, and really cool job. But "bolt it in" is a stretch... in both effort and wallet.
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Agreed! Save your sanity and your money and go with the mopar small or big block.
There were many times I wanted to just jerk the Hemi out and call it quits. I blame the frustration on the aftermarket manufacturers that have no shame taking your money and leaving you in the dust.
The only guy that stepped up to the plate was Bill Reilly with the Alterkation front end RMS Chassis components. The rest of them can go "you know what" themselves.
 
gocirino said:
Agreed! Save your sanity and your money and go with the mopar small or big block.
There were many times I wanted to just jerk the Hemi out and call it quits. I blame the frustration on the aftermarket manufacturers that have no shame taking your money and leaving you in the dust.
The only guy that stepped up to the plate was Bill Reilly with the Alterkation front end RMS Chassis components. The rest of them can go "you know what" themselves.
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I would agree.....I'm still waiting on parts that were supposed to be done in August

9-29 updates 003.jpg
 
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