12s in a challenger with a stock bottom 340?
#1829602
05/18/15 10:46 PM
05/18/15 10:46 PM
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Joined: Jun 2013
Posts: 54 US
BLACK71
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OP
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Joined: Jun 2013
Posts: 54
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I have a fresh short block 340 that I am looking to get into the 12s with. 30 over, stock stroke, replacement "10.5" compression pistons. No cam or heads yet. Victor intake, msd ignition...3.91s and an auto trans (2400 stall converter but realize it'll prolly need more). This is another "budget build" and not looking to run spray or forced induction.
RMNS 10:9-10
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Re: 12s in a challenger with a stock bottom 340?
[Re: BLACK71]
#1829634
05/18/15 10:57 PM
05/18/15 10:57 PM
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Joined: Jan 2003
Posts: 11,710 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,710
Portage,michigan
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Set of cleaned up Eddie heads. Cam and rockers for 600 or so gross lift, mild 240 ish@50 flat tappet cam and a nice 750 carb and your there. It would get well into the12's with a different convertor.
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: 12s in a challenger with a stock bottom 340?
[Re: BLACK71]
#1829723
05/19/15 12:00 AM
05/19/15 12:00 AM
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Joined: Jul 2013
Posts: 561 USA
B3RE
mopar
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mopar
Joined: Jul 2013
Posts: 561
USA
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9.5:1 CR 224@.050 duration 273 rockers 2.02/1.6 pocket ported irons Air gap w/750 Edelbrock/650-700 Holley 1-5/8" headers/2.5" duals
= = = = = = =
12's on a budget!
Want more?
Upgrade to 1.6:1 roller rockers, and correct the geometry. Get a good 32-3500 converter
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
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Re: 12s in a challenger with a stock bottom 340?
[Re: BLACK71]
#1829750
05/19/15 12:26 AM
05/19/15 12:26 AM
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Joined: Jan 2003
Posts: 11,710 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,710
Portage,michigan
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I bet that above combo wouldn't run 12's in a stock weight car with that 2400 stall convertor. The stock cam is about that big, and stock 340 is 10.5 compression, not 9.5. Sounds like a mid13's combo to me....... But who knows.
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: 12s in a challenger with a stock bottom 340?
[Re: B3422W5]
#1829757
05/19/15 12:36 AM
05/19/15 12:36 AM
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Joined: Jul 2013
Posts: 561 USA
B3RE
mopar
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mopar
Joined: Jul 2013
Posts: 561
USA
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I bet that above combo wouldn't run 12's in a stock weight car with that 2400 stall convertor. The stock cam is about that big, and stock 340 is 10.5 compression, not 9.5. Sounds like a mid13's combo to me....... But who knows. Yeah, I originally built that combo to go high 13's in a stock weight '72 Duster. It actually had a smaller cam, performer (no RPM) manifold, and a 625 Carter AFB. It went 12.90s with a 3.55 gear and 2200 converter. Changed to 1.6 rollers, air gap manifold, and a 750 Edelbrock carb, did a little more work to the heads, and went 12.30s. It's ALL about the combination.
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
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Re: 12s in a challenger with a stock bottom 340?
[Re: BLACK71]
#1829762
05/19/15 12:41 AM
05/19/15 12:41 AM
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Joined: Jan 2003
Posts: 11,710 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,710
Portage,michigan
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Great job. Surprising ET. Impressive.
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: 12s in a challenger with a stock bottom 340?
[Re: B3422W5]
#1829772
05/19/15 12:54 AM
05/19/15 12:54 AM
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Joined: Jul 2013
Posts: 561 USA
B3RE
mopar
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mopar
Joined: Jul 2013
Posts: 561
USA
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Thanks!
I never expected those results myself, but it definitely changed the way I cam my engines these days, especially pump gas street motors.
I did get ahead of myself when I hit submit on that last post. I forgot to mention that we changed the gear from a 3.55 with a 25.5" tire, to a 4.10 with a 28" tire, and the converter to a 3500 when we went 12.30s. I'm sure the converter helped a lot, but the gear probably not so much with the tire change.
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
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Re: 12s in a challenger with a stock bottom 340?
[Re: BLACK71]
#1829814
05/19/15 02:26 AM
05/19/15 02:26 AM
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Joined: Mar 2006
Posts: 9,827 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,827
MI, usa
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My wife's Challenger, though it is a 360. 9-1,224@050" hyd roller. ported smog castings, LD340, 650 Holley, TTI headers and full exh. 275radials 3.55, 4 speed 2.42 1st gear. In street trim 12.70@108. doug
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Re: 12s in a challenger with a stock bottom 340?
[Re: BLACK71]
#1829829
05/19/15 03:36 AM
05/19/15 03:36 AM
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Joined: Jun 2013
Posts: 54 US
BLACK71
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Awesome loving the info guys and do appreciate it! I do have some altitude fighting me, 2700 and in the summer a lot of times 4000+ corrected. Ideally I'd like to run iron heads simply for the originality look but obviously there's a time to draw the line on et goals vs looks.
RMNS 10:9-10
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Re: 12s in a challenger with a stock bottom 340?
[Re: BLACK71]
#1829862
05/19/15 08:20 AM
05/19/15 08:20 AM
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Joined: Feb 2005
Posts: 20,163 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,163
PA.
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Most of our Mopars members over cam their small blocks. Matts 1970 duster runs 10.50's with a 520 solid Racer Brown cam at over 3000 pounds.
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
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Re: 12s in a challenger with a stock bottom 340?
[Re: B3RE]
#1829968
05/19/15 12:44 PM
05/19/15 12:44 PM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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I bet that above combo wouldn't run 12's in a stock weight car with that 2400 stall convertor. The stock cam is about that big, and stock 340 is 10.5 compression, not 9.5. Sounds like a mid13's combo to me....... But who knows. Yeah, I originally built that combo to go high 13's in a stock weight '72 Duster. It actually had a smaller cam, performer (no RPM) manifold, and a 625 Carter AFB. It went 12.90s with a 3.55 gear and 2200 converter. Changed to 1.6 rollers, air gap manifold, and a 750 Edelbrock carb, did a little more work to the heads, and went 12.30s. It's ALL about the combination. easier to do in a Duster. The Challenger is probably 800lbs heavier. So using a stock bottom end 340 you'll want as much compression as you can handle. You'll need a decent set of heads, decent cam, and much more stall. Now if you want to use a 440 it's much easier.
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Re: 12s in a challenger with a stock bottom 340?
[Re: Mr.Yuck]
#1829998
05/19/15 01:09 PM
05/19/15 01:09 PM
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Joined: Sep 2004
Posts: 22,873 Chicken coop
dustergirl340
Chicken Little
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Chicken Little
Joined: Sep 2004
Posts: 22,873
Chicken coop
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The Challenger is probably 800lbs heavier.
My husband's small block '72 Challenger weighs 3,340 pounds. My small block '73 Duster weighs 3,300 pounds. Both all metal body full interior street cars.
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Re: 12s in a challenger with a stock bottom 340?
[Re: Mr.Yuck]
#1830059
05/19/15 02:26 PM
05/19/15 02:26 PM
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Joined: Jul 2013
Posts: 561 USA
B3RE
mopar
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mopar
Joined: Jul 2013
Posts: 561
USA
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I bet that above combo wouldn't run 12's in a stock weight car with that 2400 stall convertor. The stock cam is about that big, and stock 340 is 10.5 compression, not 9.5. Sounds like a mid13's combo to me....... But who knows. Yeah, I originally built that combo to go high 13's in a stock weight '72 Duster. It actually had a smaller cam, performer (no RPM) manifold, and a 625 Carter AFB. It went 12.90s with a 3.55 gear and 2200 converter. Changed to 1.6 rollers, air gap manifold, and a 750 Edelbrock carb, did a little more work to the heads, and went 12.30s. It's ALL about the combination. easier to do in a Duster. The Challenger is probably 800lbs heavier. So using a stock bottom end 340 you'll want as much compression as you can handle. You'll need a decent set of heads, decent cam, and much more stall. Now if you want to use a 440 it's much easier. The Challenger is certainly heavier, but unless it is a highly optioned BB/Hemi convertible, I doubt it's anywhere near 800 pounds. Btw, what does the compression do for it?
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
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Re: 12s in a challenger with a stock bottom 340?
[Re: dvw]
#1830060
05/19/15 02:29 PM
05/19/15 02:29 PM
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Joined: Jul 2013
Posts: 561 USA
B3RE
mopar
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mopar
Joined: Jul 2013
Posts: 561
USA
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My wife's Challenger, though it is a 360. 9-1,224@050" hyd roller. ported smog castings, LD340, 650 Holley, TTI headers and full exh. 275radials 3.55, 4 speed 2.42 1st gear. In street trim 12.70@108. doug ] That's what I'm talking about, Doug! A car that is a pleasure to drive, and still gets it done when the pedal is on the mat. Very nice car!
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
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