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Re: 12s in a challenger with a stock bottom 340? [Re: cudadoug] #1831108
05/20/15 09:58 PM
05/20/15 09:58 PM
Joined: Feb 2005
Posts: 20,116
PA.
pittsburghracer Offline
"Little"John
pittsburghracer  Offline
"Little"John

Joined: Feb 2005
Posts: 20,116
PA.
Originally Posted By cudadoug
Originally Posted By pittsburghracer
It ran 11.82 with a slightly better engine when I owned it and it was still on the street.


Describe this better engine that you speak of...




I built a 340 with 11.5-1 Direct Connection pistons, 590 lift solid cam, and a portasonic intake manifold.


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: 12s in a challenger with a stock bottom 340? [Re: joes68340s] #1831109
05/20/15 10:00 PM
05/20/15 10:00 PM
Joined: Oct 2010
Posts: 463
Rescue CA.
joes68340s Offline
mopar
joes68340s  Offline
mopar

Joined: Oct 2010
Posts: 463
Rescue CA.
The trick with the 340 is 12s on a reasonable street gear. Most of these builds are 360s and have the street gear with the low end torque. All my 340s needed at least 3.91 and rpm to hit 12s however mine were with old school cams and unported heads big difference in the newer cams. I have a AAR Cuda I want to set up with a stock stroke 340. Will not run the Six Pack.

Re: 12s in a challenger with a stock bottom 340? [Re: BLACK71] #1831437
05/21/15 02:10 PM
05/21/15 02:10 PM
Joined: Jun 2013
Posts: 54
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BLACK71 Offline OP
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What kind of fuel system do you guys use to support these combos?


RMNS 10:9-10
Re: 12s in a challenger with a stock bottom 340? [Re: BLACK71] #1831448
05/21/15 02:25 PM
05/21/15 02:25 PM
Joined: Jul 2013
Posts: 561
USA
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B3RE Offline
mopar
B3RE  Offline
mopar
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Joined: Jul 2013
Posts: 561
USA
Carter Street mechanical pump, 3/8" fuel line and pickup. Nothing fancy.


Mike Beachel

I didn't write the rules of math nor create the laws of physics, I am just bound by them.
Re: 12s in a challenger with a stock bottom 340? [Re: B3RE] #1831476
05/21/15 02:53 PM
05/21/15 02:53 PM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
Not enough dumb comments...yet

Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Originally Posted By B3RE
Carter Street mechanical pump, 3/8" fuel line and pickup. Nothing fancy.


stock 5/16 would even work, but if you are starting from scratch, just go w/ 3/8 just in case you upgrade later.

Re: 12s in a challenger with a stock bottom 340? [Re: Mr.Yuck] #1831484
05/21/15 03:02 PM
05/21/15 03:02 PM
Joined: Jan 2003
Posts: 11,701
Portage,michigan
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B3422W5 Offline
I Live Here
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I Live Here
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Posts: 11,701
Portage,michigan
Originally Posted By Mr.Yuck
Originally Posted By B3RE
Carter Street mechanical pump, 3/8" fuel line and pickup. Nothing fancy.


stock 5/16 would even work, but if you are starting from scratch, just go w/ 3/8 just in case you upgrade later.


I run stock 5/16 line on my Duster, best so far in my signature. Pretty sure I will get it in the 11.50's with just tuning. Haven't really touched it yet. Getting rid of the power steering, factory fan and water pump and going manual steering, electric fan and water pump might get it under that, but then it would need a cage.... Don't want that for this car. Only had it out twice so far and just wanted to race it, as it got done late last summer..... This year more tinkering.

Last edited by B3422W5; 05/21/15 03:04 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

Re: 12s in a challenger with a stock bottom 340? [Re: BLACK71] #1831814
05/21/15 11:15 PM
05/21/15 11:15 PM
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
C
cudadoug Offline
master
cudadoug  Offline
master
C

Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
Originally Posted By BLACK71
What kind of fuel system do you guys use to support these combos?


OE 5/16 line and a HP mech pump will move enough fuel to go pretty fast. Bonus: Look STOCK. Remember, no matter how much pump and line you have, it's metered by the needle and seat.

Where's Dwayne Porter these days? Mid 10's with a roller 440 in a Satellite with mech pump and the OE 5/16 line.

L O L ! ! !

Re: 12s in a challenger with a stock bottom 340? [Re: skicker] #1831983
05/22/15 08:56 AM
05/22/15 08:56 AM
Joined: Feb 2003
Posts: 1,942
Metro Detroit
OUTLAWD Offline
top fuel
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top fuel

Joined: Feb 2003
Posts: 1,942
Metro Detroit
Originally Posted By crackedback
A 360, j head with an xe268H in a Demon can run 12.50's or better in the right hands.

Takes work to fine tune the combo and with an auto, the converter is key.


Truth. I had a 360, mildly worked J head, XE268, LD340, 750 vac sec.
Ran 12.75 in a daily driven Dart with a stock ~2200rpm stall and 3.23's. Ran 12.75 @ 107 in good air. Car sat for 8 years, went through it and ran 12.9 @ 105 in the heat of the summer.

Same sluggish 1.9 60' laugh2

First time out playing with spray, on a nasty day went from 13.3 @ 104 to a 12.18 @ 116 on a 47 jet, not hitting it til 100' out.




Originally Posted By skicker
I've come to the disappointing conclusion I probably can't hit the 12's with a 3.23 gear. frowwn Car feels good but I think its at about the 13.30's. shruggy 3.91 gears are ready to go in...that should do it up but I'm on the fence since a newer design looser convertor may work better...maybe something in the 4500 range... work


You can get there, just takes a well matched combo. I went through the gear/converter debate many times. I prefer the street manners of the stock converter and 3.23's.


Faster, Faster until the thrill of speed overcomes the fear of death...

71 Swinger - slowly collecting dust/parts
66 Belv. II - just a streetcar
88 Mustang - turbo LS beater
Re: 12s in a challenger with a stock bottom 340? [Re: BLACK71] #1832609
05/23/15 01:09 AM
05/23/15 01:09 AM
Joined: Jun 2013
Posts: 54
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BLACK71 Offline OP
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How well would an m1 work


RMNS 10:9-10
Re: 12s in a challenger with a stock bottom 340? [Re: BLACK71] #1832630
05/23/15 01:59 AM
05/23/15 01:59 AM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
I Win
Quicktree  Offline
I Win
Q

Joined: Jan 2003
Posts: 32,394
Originally Posted By BLACK71
How well would an m1 work
didn't read the whole thread but we have done it with a stock 340 other than the cam which was a comp cam 305/525 with an M1. still have the motor. it ran 12.48s at 107mph if i remember correctly

Re: 12s in a challenger with a stock bottom 340? [Re: DartS] #1832633
05/23/15 02:02 AM
05/23/15 02:02 AM
Joined: Jan 2003
Posts: 32,394
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Quicktree Offline
I Win
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I Win
Q

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Posts: 32,394
Originally Posted By DartS
My buddies 73 Challenger 340 with auto weighed 3500 when he had it weighed.
that is exactly what out 70 challenger weighed,

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