pump gas 340 stock stroke 11.50 combos
#1899535
08/26/15 01:36 AM
08/26/15 01:36 AM
|
Joined: Nov 2004
Posts: 3,518 pacific northwest
Stroker Scamp
OP
master
|
OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
|
Looking to upgrade the 340/360 heads in the Duster over the winter Don't have a lot of money to go into this build would like a streetable combo/low buck deal so tell me what has worked for you What I have new 750 DP, Eddy RPM, stock bottom end, slight cam 727, 3k convertor, stock tank, mech fuel pump, cheapy headers with a 8 3/4, 4.10 gear and a spool, new micky DR tires
Last edited by Stroker Scamp; 08/26/15 01:38 AM.
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: ademon]
#1899562
08/26/15 02:19 AM
08/26/15 02:19 AM
|
Joined: Nov 2004
Posts: 3,518 pacific northwest
Stroker Scamp
OP
master
|
OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
|
What do you mean by stock bottom end ?? 1970 or 1972 or?? A true 11.50 street trim 340 will be a bit of a rascal on the street! Well what the motor has now is a stock bottom end not apposed to buying new pistons and rods but keeping the crank
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1899673
08/26/15 11:59 AM
08/26/15 11:59 AM
|
Joined: Sep 2007
Posts: 1,897 Spahn Ranch
RMCHRGR
top fuel
|
top fuel
Joined: Sep 2007
Posts: 1,897
Spahn Ranch
|
I agree that an 11.50 stock-stroke 340 won't be too streetable if that is what you are after. You're gonna need to spin it up pretty good so oil system must be up to par. Shifted my old W2 combo at 7,200 with a MP .557 solid cam. I drove it on the street and it was pretty high strung. Idled at 1,100 with around 7" of vacuum. I switched from a 4.30 gear to 4.10 and it had trouble with less gear, even though it's only a small percentage change. Needed a lot of pump shot to get it moving. It was also tough to tune part throttle driving on that thing.
For the heads, a set of 'prepped' RHS or EQ iron heads by one of the regular vendors are a good bang for the buck, they will flow much better than any stock head.
Currently finishing up a new 416 build and I switched from W2s to ported RHS. No numbers yet. The W2s I had were not ported though and had 2.02 valves which are pretty pedestrian by today's standards.
Or maybe just save a little coin and buy some Eddies so you can run a little more compression and save some weight off the front end.
750 DP, RPM intake and a 'slight cam' are not gonna cut it. Also, 11.50s are more than just heads. Need more gear and converter too, like 4.30+ and at least a 3,500+ converter. Car also needs to be pretty light, like under 3,200 with driver.
Good choice for a larger budget carb could be an 850 TQ if you have the patience to mess with it. Take off the choke stuff and it flows pretty good. Find a Holley Strip Dominator intake with the spread bore opening, they can be found relatively cheap.
Only managed a 12.20 @ 110 with my old W2 340 but it was tired and had a broken piston ring in one cylinder. Maybe could have gone 11.80s if it was right. Car is under 3,200 with me in it, 4.10 gear, 904 with a low gear set, 10" 3,500 converter, 275/60/15 drag radial and Caltracs. Launching just off idle netted a 1.7 60 ft.
Hope that helps.
'71 Duster '72 Challenger '17 Ram 1500
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1899690
08/26/15 12:29 PM
08/26/15 12:29 PM
|
Joined: Jan 2003
Posts: 8,079 Tulsa OK
Bad340fish
master
|
master
Joined: Jan 2003
Posts: 8,079
Tulsa OK
|
Streetable is all in opinion. My 360 is 11:1 KB107s, Shady Dell stage II Eddie heads, 258@.050 solid roller, 4500 converter, 3.91 gear, 830 Holley,full exhaust system, 3525lbs. It has been a best of 11.18@120.5 in good air and is very streetable in MY opinion. It will get 13-14mpg on the highway and has completed 3 drag weeks. I drive it to work, to run errands, to get groceries, it is streetable. It has a thumpy 1000rpm idle and it gets up on the converter to get moving but nothing that stops it from being street driven anywhere. Going down 20 cubes might move up the RPM range some but I don't see it having much of a negative effect on street driving.
68 Barracuda Formula S 340
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1899703
08/26/15 12:53 PM
08/26/15 12:53 PM
|
Joined: Jan 2003
Posts: 1,238 North Central, Indiana
Roughbird72
pro stock
|
pro stock
Joined: Jan 2003
Posts: 1,238
North Central, Indiana
|
Looking to upgrade the 340/360 heads in the Duster over the winter Don't have a lot of money to go into this build would like a streetable combo/low buck deal so tell me what has worked for you What I have new 750 DP, Eddy RPM, stock bottom end, slight cam 727, 3k convertor, stock tank, mech fuel pump, cheapy headers with a 8 3/4, 4.10 gear and a spool, new micky DR tires "Don't have a lot of money to go into this build" That may be your biggest obstacle. You're gonna have to pull some Rs with a 3.31" stroke & you'll want quality parts to make it reliable. Your carb is little on the small side,a solid or roller cam may be needed & you'll need more converter.
72 Plymouth Roadrunner 11.08@123.25
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Bad340fish]
#1899706
08/26/15 01:01 PM
08/26/15 01:01 PM
|
Joined: Sep 2007
Posts: 1,897 Spahn Ranch
RMCHRGR
top fuel
|
top fuel
Joined: Sep 2007
Posts: 1,897
Spahn Ranch
|
Streetable is all in opinion. My 360 is 11:1 KB107s, Shady Dell stage II Eddie heads, 258@.050 solid roller, 4500 converter, 3.91 gear, 830 Holley,full exhaust system, 3525lbs. It has been a best of 11.18@120.5 in good air and is very streetable in MY opinion. It will get 13-14mpg on the highway and has completed 3 drag weeks. I drive it to work, to run errands, to get groceries, it is streetable. It has a thumpy 1000rpm idle and it gets up on the converter to get moving but nothing that stops it from being street driven anywhere. Going down 20 cubes might move up the RPM range some but I don't see it having much of a negative effect on street driving. I think you are basically confirming what I said - need good heads (you have Shady Dell stage II Eddie heads), larger cam (258@.050 solid roller), larger carb (830) more gear and converter (4500) though you probably can get away with slightly less gear in your car (3.91) with the few more cubes. Streetable is an opinion sure, but you need to know how to make it work on the street. A race car is somewhat more straightforward, you choose the parts and tune it for best ET and or consistency. Again, I had a tough time with part throttle driving, took a long time to sort it out and was very finicky. Once it's tuned right it's fine but getting there can be difficult when you have stuff designed for WOT operating at part throttle most of the time. Just a lot of trade offs for what most consider 'normal' drivability. You gotta be willing to put the time in. I am hoping that the stroker will be more forgiving tuning-wise.
'71 Duster '72 Challenger '17 Ram 1500
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1899717
08/26/15 01:13 PM
08/26/15 01:13 PM
|
Joined: Jan 2003
Posts: 11,786 Portage,michigan
B3422W5
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 11,786
Portage,michigan
|
My little stock stroke 318 I think has the potential to run 11.50's. Best so far in signature. It's 3415 with me in it. At 3200 pounds and electric water pump and fan think it would do it. This is 10.44 compression with iron heads and dinky hydraulic cam. Shift it at 6200 and only trap at 6k. I am sure deeper gears would pick it up some, only running 4.10's with 28 tire currently, as would a more aggressive cam, but its ultra street able currently.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car Best so far, 10.32 1/4 1.41 best 60 foot 6.56 at 104.17
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: B3422W5]
#1900008
08/26/15 10:15 PM
08/26/15 10:15 PM
|
Joined: Nov 2004
Posts: 3,518 pacific northwest
Stroker Scamp
OP
master
|
OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
|
My little stock stroke 318 I think has the potential to run 11.50's. Best so far in signature. It's 3415 with me in it. At 3200 pounds and electric water pump and fan think it would do it. This is 10.44 compression with iron heads and dinky hydraulic cam. Shift it at 6200 and only trap at 6k. I am sure deeper gears would pick it up some, only running 4.10's with 28 tire currently, as would a more aggressive cam, but its ultra street able currently. Your combo is what I am looking for. I don't have to hit the 11.50 mark but it would be nice. Heads are the biggest part of the deal I think Thanks for all the input and keep it coming
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1900011
08/26/15 10:19 PM
08/26/15 10:19 PM
|
Joined: Feb 2015
Posts: 2,117 CA
crackedback
top fuel
|
top fuel
Joined: Feb 2015
Posts: 2,117
CA
|
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1900034
08/26/15 10:48 PM
08/26/15 10:48 PM
|
Joined: Oct 2003
Posts: 11,702 W. Kentucky
justinp61
I Live Here
|
I Live Here
Joined: Oct 2003
Posts: 11,702
W. Kentucky
|
My 340 was .030 over, 11.4-1, ported Edelbrocks, 236/242 @ .050, .588.592 hydraulic, Weiand X-Cellerator, Quick Fuel 750, 727, the converter flashed 5000, 4.30 gears on a 275 radial went 11.60 at 3240#.
BTW, I shifted it at 6400.
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1900042
08/26/15 10:57 PM
08/26/15 10:57 PM
|
Joined: Jan 2003
Posts: 11,786 Portage,michigan
B3422W5
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 11,786
Portage,michigan
|
My little brothers car. 66 dart, all steel, full interior, 3350 with him. 360 Ported eddies 904 Weiand excellerator 750 Holley 10 to 1 Flat tappet 4.30 gears 11.38 at 116+
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car Best so far, 10.32 1/4 1.41 best 60 foot 6.56 at 104.17
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1900418
08/27/15 02:43 PM
08/27/15 02:43 PM
|
Joined: Jan 2003
Posts: 6,266 Renton Washington
Triple Threat
master
|
master
Joined: Jan 2003
Posts: 6,266
Renton Washington
|
Heads are the biggest part of the deal I think Thanks for all the input and keep it coming I know where there is a set of IMM ported eddies and a 4" crank just sitting...
-Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1900434
08/27/15 03:07 PM
08/27/15 03:07 PM
|
Joined: Jan 2003
Posts: 13,492 Marion, South Carolina [><]
an8sec70cuda
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 13,492
Marion, South Carolina [><]
|
My '71 Demon ran 7.30s-7.40s in the 1/8 w/ a pump gas stock stroke 340. 340 + .030" w/ old Speed Pro flattops. Stock bottom end otherwise. J heads w/ mild cleanup. Comp Cams solid flat tappet, 248° at .050", about .510" lift I believe, 108° LSA Holley strip dominator single plane manifold, 750 holley DP 1 5/8" headers, run open 4.88 geared 8.75 and SS springs, 28x10.5 slicks 904 w/ low first gear and an unknown 8" converter
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: an8sec70cuda]
#1901053
08/28/15 01:04 PM
08/28/15 01:04 PM
|
Joined: Aug 2003
Posts: 3,249 Between a rock & a hard place
cudadoug
master
|
master
Joined: Aug 2003
Posts: 3,249
Between a rock & a hard place
|
Here's a post from another board I created. I strongly disagree with such a goal makes a "rowdy" or non-street friendly combo.
Soooo, quick background: Assembled a budget 416 a few years ago, and managed to run a best lap of 10.14 @ 128, irritate a few big block guys and won a few rounds including a Mopar race at Sac. Developed a bearing issue, so after we took it down to inspect and repair the car owner decided "enough". Having a low 10 second Duster was fun, but he wanted to convert the car to a 12.0 Sportsman car (no jacket, no dated belts, no fear of a mandatory engine diaper) AND be streetable. So we made changes, and I assembled a new motor.
Back to the 3.31 stroke crank New SCAT rods Sealed Power hyper flat tops (calculated CR is 10.3:1) Comp Cam Hydraulic cam, .545/.545 - 241/247 @ .050" (XE285HL) Same RHS heads from the 416, fresh with new Beehive springs. FAST EFI 2.0
Same 904 from the 416, had the 8" converter tightened as much as possible, but still a touch too loose for the street...Need to work on that over the winter; we'll change it to a Lupo 9.5" that's on the shelf.
Swapped out the 4.56/spool for a 3.91 and Sure Grip
Tossed the many runs old Phoenix slicks on. Hmmm, 3.91's and 29.5 tire? Isn't that the same as a 3.55/27" gear/tire combo??? We want this thing to go 12.0's not 13.0's...LOL!
In addition, the car is now 170 lbs heavier: Stereo, FULL 3" exhaust to the rear, and power windows...
A tank full of 91 octane and some octane booster and off we go to the track.
Three runs made. Never touched anything except for some Cal Track adjustments and ran a best of 11.77 @ 114. Wow...love those 340's! Footnotes:
30* total timing.
Shifting at 5000 RPM. Yes, 5,000...it is a street car after all!
Across the stripe at (go back and re-read the gear/tire height) 5,200.
Maybe next time out, we'll get "serious" and run it to 6,000 and put some more timing in it. Oh and maybe play with the tune up?? We left the EFI on the base settings...didn't touch it. But how cool...change "jets" with the touch screen with the hood closed!
Should be a truly low maintenance, fun street/strip car!
****EDIT**** Didn't realize Cracked posted the link. Sorry for the repost!
Last edited by cudadoug; 08/28/15 01:40 PM.
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: dizuster]
#1903116
08/31/15 01:39 PM
08/31/15 01:39 PM
|
Joined: Aug 2003
Posts: 3,249 Between a rock & a hard place
cudadoug
master
|
master
Joined: Aug 2003
Posts: 3,249
Between a rock & a hard place
|
**Update: Ran the Duster in a "street" class so on went a pair of MT drag radials, 315/60/15, a good inch+ shorter than the 29.5 slicks and wont have much growth at speed.
Also removed the 2 chamber Flowmaster muffs, replacing them with quieter 3 chamber Magnaflows.
Still 5200 in the shifts, but now 5800 at the stripe vs. the 5200 with slicks.
11.49 @ 116.83 off the trailer 11.45 @ 117.40 2nd run
WOW. If we move the shift light up to 6500-ish, perhaps the little 340 will give me a .30-something...
100% streetable; have logged a couple of hundred more miles since the first outing.
Previous posts highlights:
Back to the 3.31 stroke crank New SCAT rods Sealed Power hyper flat tops (calculated CR is 10.3:1) Comp Cam Hydraulic cam, .545/.545 - 241/247 @ .050" (XE285HL) Same RHS heads from the 416, fresh with new Beehive springs. FAST EFI 2.0
Same 904 from the 416, had the 8" converter tightened as much as possible, but still a touch too loose for the street...Need to work on that over the winter; we'll change it to a Lupo 9.5" that's on the shelf.
Swapped out the 4.56/spool for a 3.91 and Sure Grip
Tossed the many runs old Phoenix slicks on. Hmmm, 3.91's and 29.5 tire? Isn't that the same as a 3.55/27" gear/tire combo??? We want this thing to go 12.0's not 13.0's...LOL!
In addition, the car is now 170 lbs heavier: Stereo, FULL 3" exhaust to the rear, and power windows...
A tank full of 91 octane and some octane booster and off we go to the track.
Three runs made. Never touched anything except for some Cal Track adjustments and ran a best of 11.77 @ 114.
Last edited by cudadoug; 08/31/15 01:46 PM.
|
|
|
Re: pump gas 340 stock stroke 11.50 combos
[Re: Stroker Scamp]
#1903603
09/01/15 12:36 AM
09/01/15 12:36 AM
|
Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
I would post my "streetable" 340 combo but no one would believe it. So here are a few of the minor details.
I will keep it under 7K RPM, use 1.875 headers, a Strip Dominator and CE Slide-A-Links.
Static CR is a MEASURED 11.08 (may go a bit higher) and a custom cam.
Should fall into the 11's and my wife will drive it to the store.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
|
|