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relatively stock 383 in a 4000lb charger-12's remotely possi
#3289643
02/15/25 12:17 PM
02/15/25 12:17 PM
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Joined: Sep 2003
Posts: 20,805
north of coder
moparx
OP
Buying your homeless and unwanted bolt on battery terminals
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OP
Buying your homeless and unwanted bolt on battery terminals
Joined: Sep 2003
Posts: 20,805
north of coder
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400lb charger with relatively stock 383/727/3.91/29-12.50 tires combination. converter is old B&M high stall "hole shot" unit that stalls around 26-2800 with foot brake, and flashes to 2900+ from idle in first gear. intake is DP4B with 850 T-quad. cam is racer brown SSH-25 in straight up. ignition is factory points system, which i plan to upgrade at some point. the curve has been modified so i can run 16* initial and 33 total. i can re-do the curve to run 18* initial and 34* total. i have also played with the vacuum advance so cruising rpm [roughly 3000rpm @ 65mph] gets pretty reasonable mileage with non-alcohol 91 octane. car runs pretty good now, but i feel it could be better. as no tracks are closer than 2hours+ from here, i will be using a Dragy to track performance. could this combo even come close to the 12 second bracket ? thanks to those that are way more knowledgeable than me with this subject. 
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: moparx]
#3289653
02/15/25 12:55 PM
02/15/25 12:55 PM
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Joined: Jun 2014
Posts: 3,610
Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,610
Md.
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Nitrous will get it there.
America First!
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: moparx]
#3289662
02/15/25 01:48 PM
02/15/25 01:48 PM
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Joined: Jan 2003
Posts: 7,675
Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,675
Minnesota
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With that combination, at that weight, 12s is highly unlikely. But it can still be a fun, fast streetcar as is. Or you can start chipping away at it, making changes, and get it into the 12s.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: Hemi_Joel]
#3289666
02/15/25 02:02 PM
02/15/25 02:02 PM
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Joined: Dec 2005
Posts: 12,982
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 12,982
Fulton County, PA
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Gonna take ~330 HP or so, whatever it takes to get there. Heads/cam maybe. And a better converter at a minimum.
If the results don't match the theory, change the theory.
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: Stanton]
#3289668
02/15/25 02:09 PM
02/15/25 02:09 PM
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Joined: Feb 2003
Posts: 10,504
Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,504
Someplace you aren't
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Not easily or inexpensively !!! 12's is so easy to say - not so easy to achieve !
My '69 'runner had a 12.5:1 383 with a .500 lift cam, tunnel ram with two 600 cfm carbs. Headers, etc, etc. 4-speed with 4:56 gears and 8x28 slicks.Tuned ignition and carbs.
Best we could do with that was low 13's. What sort of mph did you see? What density altitude?
I want my fair share
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: moparx]
#3289676
02/15/25 02:23 PM
02/15/25 02:23 PM
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Joined: Jan 2003
Posts: 1,815
Windsor, ON, Canada
Diplomat360
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,815
Windsor, ON, Canada
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400lb charger with relatively stock 383/727/3.91/29-12.50 tires combination. converter is old B&M high stall "hole shot" unit that stalls around 26-2800 with foot brake, and flashes to 2900+ from idle in first gear. intake is DP4B with 850 T-quad. cam is racer brown SSH-25 in straight up. What are the specs on that cam? Otherwise I'm thinking that getting into the 12's ET would require a hotter converter, which should be driven by a bigger cam.
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: moparx]
#3289678
02/15/25 02:30 PM
02/15/25 02:30 PM
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Joined: Feb 2005
Posts: 4,363
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,363
Prospect, PA
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400lb charger with relatively stock 383/727/3.91/29-12.50 tires combination. converter is old B&M high stall "hole shot" unit that stalls around 26-2800 with foot brake, and flashes to 2900+ from idle in first gear. intake is DP4B with 850 T-quad. cam is racer brown SSH-25 in straight up. ignition is factory points system, which i plan to upgrade at some point. the curve has been modified so i can run 16* initial and 33 total. i can re-do the curve to run 18* initial and 34* total. i have also played with the vacuum advance so cruising rpm [roughly 3000rpm @ 65mph] gets pretty reasonable mileage with non-alcohol 91 octane. car runs pretty good now, but i feel it could be better. as no tracks are closer than 2hours+ from here, i will be using a Dragy to track performance. could this combo even come close to the 12 second bracket ? thanks to those that are way more knowledgeable than me with this subject. Doable but depending what you are starting with for compression ratio/cylinder pressure and cylinder heads, and what you’re willing to spend/change to make a difference. If you are near sea level, in decent air, blow 175 psi, and have heads that flow 250+ cfm, I think you can do it. I think a 1.80 sixty ft and 104-105 mph gets you there. Do a cranking cylinder pressure test and report back. And, I like the TQ, and I like the DP4B. I just don’t like them together. I’d like a Holley 4779 better with that manifold. Play with open and closed spacers.
Last edited by BSB67; 02/15/25 02:40 PM.
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: Hemi_Joel]
#3289679
02/15/25 02:35 PM
02/15/25 02:35 PM
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Joined: Jan 2003
Posts: 4,404
Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,404
Morrow, OH
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With that combination, at that weight, 12s is highly unlikely. But it can still be a fun, fast streetcar as is. Or you can start chipping away at it, making changes, and get it into the 12s. I agree. You have a few advantages over my daughter's 67 coronet, but I have yet to see 14's, but traction will get me there. Also weights around 4000 lbs - last time I weighed it was 4025 lbs. My combination was mismatched, but an intake and cam swap did wonders. I think I put a rpm intake on and a smaller cam. Had a street dominator intake before. It had no low end torque. Not it runs much better and much more fun to drive. The 440 I had in there for a while would have been 12s, but it had home ported 906 heads and headers.
Last edited by markz528; 02/15/25 02:36 PM.
67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: markz528]
#3289681
02/15/25 02:44 PM
02/15/25 02:44 PM
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Joined: Jan 2003
Posts: 14,615
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,615
So. Burlington, Vt.
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I’m going to go with……….”highly unlikely”.
Never say never, but I think some runs with the Dragy will be a reality check.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: fast68plymouth]
#3289710
02/15/25 05:25 PM
02/15/25 05:25 PM
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Joined: Jan 2003
Posts: 8,280
Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,280
Plymouth, MI
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On the street, with no burnout, I don’t think it’s going to be close to happening. It either needs to dead hook with a looser converter than what you’ve got, or it needs to mph really well (like 110+) to make up for the lack of traction on unprepped roads. I’m guessing low 14’s, maybe high 13’s, but you’ll be having fun and that’s the whole point!
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: fast68plymouth]
#3289715
02/15/25 05:29 PM
02/15/25 05:29 PM
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Joined: Aug 2011
Posts: 2,950
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,950
Pattison Texas
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Not a Mopar but, way back when I had a 1972 SS Chevelle I put an LS 6 454 in, headers, 850 DP Holley 4000lb , 410 gear, slicks, open headers 12.70 @ 107 so about 385 HP
Last edited by CSK; 02/15/25 05:30 PM.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: moparx]
#3289728
02/15/25 05:51 PM
02/15/25 05:51 PM
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Joined: Aug 2003
Posts: 44,287
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 44,287
Bend,OR USA
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400lb charger with relatively stock 383/727/3.91/29-12.50 tires combination. converter is old B&M high stall "hole shot" unit that stalls around 26-2800 with foot brake, and flashes to 2900+ from idle in first gear. intake is DP4B with 850 T-quad. cam is racer brown SSH-25 in straight up. ignition is factory points system, which i plan to upgrade at some point. the curve has been modified so i can run 16* initial and 33 total. i can re-do the curve to run 18* initial and 34* total. i have also played with the vacuum advance so cruising rpm [roughly 3000rpm @ 65mph] gets pretty reasonable mileage with non-alcohol 91 octane. car runs pretty good now, but i feel it could be better. as no tracks are closer than 2hours+ from here, i will be using a Dragy to track performance. could this combo even come close to the 12 second bracket ? thanks to those that are way more knowledgeable than me with this subject. I'm thinking 5:13 or 5;38 rear gears would help a bunch as long as it is a "local only " car, not a long distance (+300 mile one way car) cross country type car   Dem cars are not lightweights   , I love them 1968 Chargers   
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: moparx]
#3289749
02/15/25 06:57 PM
02/15/25 06:57 PM
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Joined: Jan 2003
Posts: 1,667
westerly, ri. usa
440lebaron
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,667
westerly, ri. usa
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4330 lb Cordoba 383 stock short block, 484 purple shaft 9" t/a converter, cast iron intake T/Q 850 1 7/8 header 4:56 S60 30X9 slick 13.34 98 mph three seasons on slicks might try 29" this year
Last edited by 440lebaron; 02/15/25 07:02 PM.
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site is not monitored 24/7 there might be a delay in response
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: CMcAllister]
#3289826
02/16/25 09:35 AM
02/16/25 09:35 AM
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Joined: Jan 2003
Posts: 11,838
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,838
Portage,michigan
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Gonna take ~330 HP or so, whatever it takes to get there. Heads/cam maybe. And a better converter at a minimum. Gonna take way more than that to get a 4000 pound car in the 12’s
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
1.41 best 60 foot
6.52 @ 105.20
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: B3422W5]
#3289834
02/16/25 10:03 AM
02/16/25 10:03 AM
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Joined: Feb 2005
Posts: 4,363
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,363
Prospect, PA
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Gonna take ~330 HP or so, whatever it takes to get there. Heads/cam maybe. And a better converter at a minimum. Gonna take way more than that to get a 4000 pound car in the 12’s There in-lies the problem with unqualified statements. 330 net actual flywheel hp could get him there. That would probably equate to something like 400 engine dyno hp, or more depending on several variables.
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Re: relatively stock 383 in a 4000lb charger-12's remotely possi
[Re: BSB67]
#3289835
02/16/25 10:17 AM
02/16/25 10:17 AM
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Joined: Aug 2011
Posts: 2,950
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,950
Pattison Texas
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Gonna take ~330 HP or so, whatever it takes to get there. Heads/cam maybe. And a better converter at a minimum. Gonna take way more than that to get a 4000 pound car in the 12’s There in-lies the problem with unqualified statements. 330 net actual flywheel hp could get him there. That would probably equate to something like 400 engine dyno hp, or more depending on several variables. I agree, the 385 ish HP I said in my previous Chevelle post would be gross flywheel HP ,
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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