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Re: Ideas for a stout stock stroke 340 build.
[Re: B3422W5]
#1674012
09/23/14 09:58 AM
09/23/14 09:58 AM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
master
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master
Joined: Jun 2005
Posts: 2,776
Ontario Canada
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Quote:
I am thinking about building a 30 over 340 "big" motor to have as a backup to this 318, and perhaps at some point replace it 
I have access to a nice standard bore 340 with its unturned steel crank, bunch of stuff I wouldn't use,( stock rods and pistons)several stock 340 pans, timing covers, etc for real cheap.
I just wondered if say cnc procomp heads, moderate roller cam, zero deck flat top pistons could make 550 horsepower or better? Or any other heads, that are cheap and available
If not it wouldn't be a significant enough upgrade to be worth doing.
In my old age I am actually back into thinking Dusters/ Darts/ Demons with 340's in them are cool.
 
Don't know if this link will work but Dodge/Plymouth/Chrysler/Mopar Crate Engine
Jesse is a member on here goes by RAMM.
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Re: Ideas for a stout stock stroke 340 build.
[Re: MattW]
#1674013
09/23/14 02:30 PM
09/23/14 02:30 PM
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Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
jyrki
master
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master
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
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I'm still in the very early stages witn my 340, but to me ti seems that 500+ hp is no problem. To be honest, my engine is not stock stroke, it's got 3.35" stroke. Bought the crank used with an aluminum flywheel for 200, and have no idea of where it's from. It's an 8-bolt unit with still std size rod journals. Anyway, it's got stock length H-profile steel rods, .030 oversize Mahle flat top pistons, self made oil pan & pump & piskup setup, mech roller cam with 265/270 degrees and .440 lobe lift, bought used from moparts. The heads were also bought from moparts, a complete set of W2's and a Victor 340 W2 intake. I ported the heads, there is 1 7/8" headers, 3.5" echaust pipes and mufflers The carb is a 750 HP holley with a 2" open spacer, and the distributer is a mopar cast iron unit with MSD 6 AL. So far I haven't tuned it at all, just set the timng and idle. I have run the car succesfully only once, and I have never driven a manual hard either at the strip or street. The valve springs had only about 140 lbe seta pressure, so I llimited teh RPM to 7000. The clutch didn't work properly and the car started to crawl when the rpm got up, didn't have a two step or line lock, so the launches were pretty soft. Still the car run 10.36/132.5 at an airport against the limiter. I really don't want a stroker at the moment! The second time out, there was a good track, the clutsh worked, and now I'm looking for a spool and 35 spline axles... HJere are the three more or less succesful runs https://www.youtube.com/watch?v=sDNpATHzTN0b
Plynouth VIP '67 TT IC EFI
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Re: Ideas for a stout stock stroke 340 build.
[Re: jyrki]
#1674014
09/23/14 03:00 PM
09/23/14 03:00 PM
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Joined: Jan 2003
Posts: 9,870
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,870
Weddington, N.C.
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A 340 is a short stroke but it's not really a small motor  The issue with the 340 (in todays way of thinking) is the piston is HEAVY and the real way to take advantage of the short stroke is to lighten the piston and use a longer rod. I grew up in a time (late 70's) when I personally remember pulling out 440 RB's out of B bodies and dropping in 340 W2's with Isky solids and the cars going faster. Back when high 11's was a respectably quick street car...and the car you drove to work every morning. 4.30's and 4.56 went in at the same time, not much fun for those guys cruising the GSP or NJT at 3800 rpm...but they were winning. I'd try to use a 2.100 or 2.00" SBC journal rod and a 6.25" 6.30 rod, if you want to keep it stock stroke the piston CH will only move up <.200 but it will help the weight by also using the lighter SBC pin. Some guys are using .812 SBF pins too. To keep it streetable in terms of grunt probably a 255-ish @.050 solid fairly wide 111-113 and in around 107, with a 285-ish CFM head and good valvetrain you should make 500+ at about 6400 or so at a streetable 11-ish CR....plus have decent (but not great) bottom end torque. If it were me I'd offset grind it to 3.45-ish and get the slug that much lighter and pick up a few more cubes....or (cheaper) just do a 360.  my old W2 340 dart 4 speed went high 11.80's 33 some years ago on street tires hazing in 1st and second....back in 1980. it was steetable, V gate and all. Fun times. 340's with a stick are still one of the most fun combos I've ever driven, I loved beating cars sporting 60-100 more cubes. Of course I never tipped my hand I was sportin' the W-2's...would you?
Last edited by Streetwize; 09/23/14 03:03 PM.
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Re: Ideas for a stout stock stroke 340 build.
[Re: Streetwize]
#1674016
09/23/14 03:11 PM
09/23/14 03:11 PM
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Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
jyrki
master
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master
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
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I've got 4.56 gears. Have no idea of what is "stret able", all of my cars have and if I had funds, I would come to drag week. A bit off thesubject, but here s the very first run with the car, no clutch at all the cr was pushed to stageand then I just smashed the first gear in off idle..., or so I thoght; it was 3rd, then never driven the car before, trying to find the frst ear with the vertical gate...unforgettable moments. https://www.youtube.com/watch?v=zfpT4JJ6xQY
Plynouth VIP '67 TT IC EFI
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Re: Ideas for a stout stock stroke 340 build.
[Re: goldduster318]
#1674019
09/23/14 10:16 PM
09/23/14 10:16 PM
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Joined: Jan 2003
Posts: 11,705
Portage,michigan
B3422W5
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 11,705
Portage,michigan
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Quote:
Quote:
Don, contact or Google Mike @ MRL Performane. He posted on another board not too long ago a 3.310" stroke 340 build he did that was pretty impressive and seemingly streetable.
I think you are talking about my engine that made 470hp and 455 lb-ft? http://www.forabodiesonly.com/mopar/showthread.php?t=241854
It's very streetable. I run it in a car with 3.23's and a 4-speed and you can drive it however and wherever you want. In the car I idle it at about 900 (has a slight lope) and it has about 13 in Hg vacuum. Getting about 13 mpg city. Goes pretty well.
Here's a video (sorry no dash). It really goes.
https://www.youtube.com/watch?v=BxQkNYRDAD8
The 318 that is in my car now( as currently configured) made 480/ 451 torque. It's got a tiny cam in it, but it makes more torque than a much bigger flat tappet solid lifter cam did. Drives and idles nicely.
I am interested in something 70-80 more horsepower.
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: Ideas for a stout stock stroke 340 build.
[Re: B3422W5]
#1674020
09/23/14 10:51 PM
09/23/14 10:51 PM
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Joined: Oct 2006
Posts: 149
N. Of Detroit, Mi
733404spdCuda
member
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member
Joined: Oct 2006
Posts: 149
N. Of Detroit, Mi
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My 340 / 378
340 Block 4.100"
3.58 eagle Crank
2.100 eagle sbc H Beam rods
Diamond Piston 9.5 comp
Edelbrock 63CC Heads CNC ported my MCH
Houghs 1.6 roller rockers
Solid 243/251 duration @ .050" .550/.570 lift
Edelbrock RPM Intake
Kevco pan with baffles
750 quickfuel carb
520HP @ 6200 and 490TQ @4500 (dyno sheet attached)
with more compression this motor should have made 550hp
Last edited by 733404spdCuda; 09/23/14 11:11 PM.
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Re: Ideas for a stout stock stroke 340 build.
[Re: 733404spdCuda]
#1674021
09/23/14 11:07 PM
09/23/14 11:07 PM
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Joined: Jan 2003
Posts: 11,705
Portage,michigan
B3422W5
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 11,705
Portage,michigan
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Quote:
My 340 / 378
340 Block 4.100"
3.58 eagle Crank
2.100 eagle sbc H Beam rods
Diamond Piston 9.5 comp
Edelbrock 63CC Heads CNC ported my MCH
Houghs 1.6 roller rockers
Solid 243/251 duration @ .050" .550/.570 lift
Edelbrock RPM Intake
Kevco pan with baffles
750 quickfuel carb
520HP @ 6200 and 490TQ @4500
with more compression this motor should have made 550hp
Nice combo 
Yep, more compression, more lift to use the heads, and probably even a 950 would get it over 550 easy.
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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