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Help with my new 340 build up
#1257740
06/26/12 02:19 PM
06/26/12 02:19 PM
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Joined: May 2004
Posts: 246
Jackson Michigan
67barrracuda
OP
enthusiast
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OP
enthusiast
Joined: May 2004
Posts: 246
Jackson Michigan
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Looking to build my first 340 sb and would like to see 450-500hp with a 750 dominator carb. I like aluminum heads, but which one. Whats the difference between the w2,w5,and w8 heads. Any help to point me in the right direction is greatly appreciated.
Thanks
67barrracuda
Jackson Michigan
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Re: Help with my new 340 build up
[Re: 67barrracuda]
#1257741
06/26/12 02:27 PM
06/26/12 02:27 PM
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Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda
I Live Here
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I Live Here
Joined: Aug 2003
Posts: 11,179
Atco NJ
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I dont think you need anything but an out of the box eddy head to make the 500 hp your requiring, if your willing to stroke it. I just made 511 hp with stock eddy heads, an air gap intake and a 750 HP carb. MY 430 BUILD
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Re: Help with my new 340 build up
[Re: 67barrracuda]
#1257743
06/26/12 02:34 PM
06/26/12 02:34 PM
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Joined: Apr 2007
Posts: 2,026
Trumbull,CT.
jim sciortino
top fuel
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top fuel
Joined: Apr 2007
Posts: 2,026
Trumbull,CT.
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Quote:
Looking to build my first 340 sb and would like to see 450-500hp with a 750 dominator carb. I like aluminum heads, but which one. Whats the difference between the w2,w5,and w8 heads. Any help to point me in the right direction is greatly appreciated.
Thanks
67barrracuda
W2,W5 and especially W8s are overkill for those levels.......not to mention alittle "involved".
Stick a 4in arm in that thing with a touched uo Eddy and you'll have a nice street combo with plenty of steam.
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Re: Help with my new 340 build up
[Re: Triple Threat]
#1257745
06/26/12 05:19 PM
06/26/12 05:19 PM
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Joined: May 2004
Posts: 246
Jackson Michigan
67barrracuda
OP
enthusiast
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OP
enthusiast
Joined: May 2004
Posts: 246
Jackson Michigan
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What I have is a 67 barracuda notchback , auto trans, 3.91 posi, 29" drag radials. Looking to build something to push it into the 11's, but be very streetable and run cool. I could build a stroker, but is it worth the money if I'm not looking for a 600hp motor. I see a lot of different head choices out there for sb mopars and was looking for what combinations really worked.
Jackson Michigan
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Re: Help with my new 340 build up
[Re: 67barrracuda]
#1257747
06/26/12 06:04 PM
06/26/12 06:04 PM
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Joined: Jan 2003
Posts: 5,484
SoCal
Brian Hafliger
master
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master
Joined: Jan 2003
Posts: 5,484
SoCal
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If you go with a 4" crank deal, and RHS heads like the ones IMM sells you'll be into the mid-low 11's.
Easy to get 480HP from a nice hyd. cam, rpm airgap intake and 10.2:1 compression.
Brian
Brian Hafliger
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Re: Help with my new 340 build up
[Re: Brian Hafliger]
#1257748
06/26/12 06:11 PM
06/26/12 06:11 PM
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Joined: Jan 2003
Posts: 11,711
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,711
Portage,michigan
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You can get well into the 11's without a stroker.
Little brother has a 9-1 360, ported eddies, weiand excellerator, dinky small tube headers( its a 66dart gt) 750 holley, and a healthier than it needs to be flat tappet cam and runs 11.40's without working up a sweat.Can drive the thing anywhere.
I have a bauudy who ran 10.90's with a comp cams 525/305 hydralic cam in a 360 but had some compression with eddies that werent ported.
Good eddies and matching parts and 11's are real easy.
Last edited by B3422W5; 06/26/12 06:12 PM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8
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Re: Help with my new 340 build up
[Re: DJVCuda]
#1257749
06/26/12 08:24 PM
06/26/12 08:24 PM
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Joined: Jun 2010
Posts: 3,112
LONG ISLAND
fishy340
master
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master
Joined: Jun 2010
Posts: 3,112
LONG ISLAND
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Quote:
I dont think you need anything but an out of the box eddy head to make the 500 hp your requiring, if your willing to stroke it.
I just made 511 hp with stock eddy heads, an air gap intake and a 750 HP carb.
MY 430 BUILD
with a 340 done right,super easy w A 4" crank for some cubes...and a lightly touched up set of eddy's..if i were you i'd do it with a hyd roller cam,no maint type deal 
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Re: Help with my new 340 build up
[Re: RobX4406]
#1257751
06/26/12 10:46 PM
06/26/12 10:46 PM
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Joined: May 2004
Posts: 246
Jackson Michigan
67barrracuda
OP
enthusiast
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OP
enthusiast
Joined: May 2004
Posts: 246
Jackson Michigan
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Thanks for all the good information.
OK, this is what I'm thinking.
stroke the motor ( what need to be done to the block for a stroker kit)
eddy heads (out of the box)
air gap intake
750 carb
Which cam and how much compression?
Jackson Michigan
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Re: Help with my new 340 build up
[Re: 67barrracuda]
#1257752
06/26/12 10:54 PM
06/26/12 10:54 PM
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Joined: May 2004
Posts: 246
Jackson Michigan
67barrracuda
OP
enthusiast
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OP
enthusiast
Joined: May 2004
Posts: 246
Jackson Michigan
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Is there any year 340 block better any another?
I have a chance to pick up a 72 bare block for $250, do you think it's worth it?
Jackson Michigan
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Re: Help with my new 340 build up
[Re: 67barrracuda]
#1257754
06/27/12 09:04 AM
06/27/12 09:04 AM
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Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda
I Live Here
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I Live Here
Joined: Aug 2003
Posts: 11,179
Atco NJ
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Quote:
stroke the motor ( what need to be done to the block for a stroker kit)
eddy heads (out of the box)
you might need to notch the bottoms of the cylinders depending on what rods and stroke you use.
and eddy's out of the box is a bad idea - have them gone through by a machine shop - mine OOTB were too tight on the valve guides and had a bunch of intake valves with too much seat runout. They also had alot of left over chunks in the water passages from being machined at teh factory.
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Re: Help with my new 340 build up
[Re: RobX4406]
#1257755
06/27/12 09:52 AM
06/27/12 09:52 AM
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Joined: Jun 2010
Posts: 3,112
LONG ISLAND
fishy340
master
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master
Joined: Jun 2010
Posts: 3,112
LONG ISLAND
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Quote:
A 340 will have to turn to get that HP. Most of the ones I've seen turn around 6500 to get there with rhs/ede heads.
I'd look at a stroker with some heads,IMM RHS, ede's with some work, much easier to get the number and don't have to turn it more than about 5500 with a 3.90 gear in the back. A good working car will run mid 11's or faster pretty and still be docile around the street.
not really my sb 340 that made 506hp did it all by 5800rpm the tq was nice like 540ish..my friends use to laugh cause i would shift at 6ooo they thought i wasnt bringing it high enough.
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Re: Help with my new 340 build up
[Re: 67barrracuda]
#1257757
06/27/12 02:03 PM
06/27/12 02:03 PM
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Joined: Jan 2003
Posts: 6,266
Renton Washington
Triple Threat
master
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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Edelbrocks are fine, or the RHS heads from Brian at IMM. But what people are saying is you should have them checked by your machine shop before bolting them on the engine. Being a mass produced item things often slip through the cracks.
I didn't have mine checked, and mine were fine but I was taking a gamble and I knew that. As a broke college student it was my only option.
If you get the RHS heads from IMM, Brian assembles them, so they would not need to be checked again.
-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
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Re: Help with my new 340 build up
[Re: fishy340]
#1257758
06/27/12 02:12 PM
06/27/12 02:12 PM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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Quote:
Quote:
A 340 will have to turn to get that HP. Most of the ones I've seen turn around 6500 to get there with rhs/ede heads.
I'd look at a stroker with some heads,IMM RHS, ede's with some work, much easier to get the number and don't have to turn it more than about 5500 with a 3.90 gear in the back. A good working car will run mid 11's or faster pretty and still be docile around the street.
not really my sb 340 that made 506hp did it all by 5800rpm the tq was nice like 540ish..my friends use to laugh cause i would shift at 6ooo they thought i wasnt bringing it high enough.
Stock stroke? With which head and how much additional work? Doubt it got there with an OOTB ede head without a 4" arm.
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