Dart 1969 - faster 1/4mile

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First set is street gears. Good for mid ten second foot brake cars. The pro gears are for race and can handle a trans brake with hard launches. The 4.30 in not sure about. Seem to be in the middle. Maybe for the off road 4x4 guys. Kim
 
Found a used Victor 2954 for ~$400 (A new one would cost ~$600 shipped to Sweden).

Looks nice. The guy before seems to have done a little work on it, hope it line up to our heads also.

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First race of the year was this weekened.

The best start was
60ft - 1.4999s
1/8 time - 6.66s
1/8 speed - 103.8mph/166.2km/h

best finish
1/4 time - 10.521s
1/4 speed - 127,7mph/204,4km/h

The 1/4mile ET is exactly the same as our best from 2020. The Victor intake didn't do much of an improvement.

One thing that bugs me is how much resitance the car has when rolling to the line up. It takes alot of energy to get the car rolling. I wonder if one of the brakes is on a little all the time, have to check it out.
 
I had the same issue with my old race car I would leave it in neutral in the staging lanes car won't move, then started checking the rear brakes I found drums a little tighter than they should be plus all the dust/ rubber from burnouts. After that you could push it around with 1 hand
 
BaNaN85 said:
Hey

Me and my father got a Dart 69 440 together which we bracket race with.
Last winter we changed the old high compression ~12.5;1 452 heads to a pair of aluminum heads ~10.6;1. We gained a little in the top end and lost in the bottom.

more info
440 0.030 over
Alu heads 84cc, 2.14, 1.81, 210cc Intake
850cfm Holley carb
Solid lifter 650lift, 320dur
727, 8" ATI 5000 stall,TB, 31*12 rears
Dana 60 w spool, 4.88
Holley blue fuel pump.
Revs a lot crossing the 1/4mile line

Engine peaked at ~560hp at ~6300rpm in the bench.
With the 452 heads it was 537hp at 6100.
From 4800rpm the alu heads were better all the way.
Here's a clip from this summer

Best ET for us 10.52s

Now where thinking about what to upgrade next. The intake is an old Weiand 7512 intake and planned to replace it with something better. We already have a RPM 7193 intake from another engine we could try and use.

Looking at info from sites like this:
#4---Ported Intake Manifolds UPDATED 08/27/2007
And an old chart from mopar muscle mag test from 2002.
Intake manifold Hp / Tq Avg Hp/Tq
(1) Edelbrock Victor : 637@6400 / 593@4700 568/570
(2) Holley Street Dominator : 636@6200 / 598@5000 573/571
(3) Mopar M1 (single plane) : 629@6100 / 589@4900 564/567
(4) Edelbrock TM7 : 618@6200 / 602@4900 569/568
(5) Edelbrock Torker 2 : 627@6300 / 593@4900 565/563
(6) Edelbrock Torker (orig) : 605@5500 / 608@4700 565/566
(7) Edelbrock Performer RPM : 610@6200 / 590@4000 556/555
(8) Edelbrock CH4B : 607@6400 / 573@4000 545/544
(9) Weiand team G (Track R) : 597@6300 / 569@4900 540/534
(10) Weiand action plus : 597@6300 / 564@4000 537/536
(11) factory 70-71 iron : 575@6200 / 581@4000 534/535

The Victor and Holley Street D (Strip Dominator the same?) seems like the best options.
Torker II and Mopar M1 as 2nd best.
RPM is a little bit away but maybe some porting on a RPM intake could help?

I asume a 950 carb could help a little also.
A friend thought we should change the 4.88 gears to 4.56 or 4.10s to lower the revs and go faster.



What is this forums general idea about the Weiand 7512 intake? It seems like an really old intake dated back to 1974.
And what other tweeks do you think can get us closer to the 9?

Best regards
Click to expand...


the weiand has terrible runner diff. , i GOT ONE DOWN TO ABOUT 24 CFM DIFF. , SEAT OF THE PANTS, CANT TELL ANY DIFF. FROM A CLEANED UP VICTOR. bUT THE VICTOR WILL FLOW AROUND 350ISH CFM , MATCHING MY HEADS BETTER .
tHE STREET DOMINATOR HASNT SHOWN TO BE THAT GOOD , BUT IS A GOOD ONE --------------JMO
 
As has been mentioned, the .650/320* cam and 10.5cr aren’t really very well suited towards each other.

The head swap from 452’s to the 84cc heads dropped the CR two points??
No other changes?
It takes about a 20cc change to make that much of a change to the CR.

What does the car weigh?
 
Yea the 452 heads were really high comp. Might need to mill down the aluminum heads a bit to make better use of the cam..

I've been thinking about the carburator, I believe it's an old Holley R4781 850dp with removed chokehouse. (6R3738CB printed on top of it)
There's an Holley 950HP 80496-1 for sale here which seems lika a nice carb but would it be a good update?
I know about the 950HP having smaller venturis then old 850 but the air intake shape of the carb looks better for racing.
 
a friend raced 440's for years and said the highest hp builds never et'd well. Look at the torque numbers you posted for the various intakes...especially the original Torker.
 
BaNaN85 said:
First race of the year was this weekened.

The best start was
60ft - 1.4999s
1/8 time - 6.66s
1/8 speed - 103.8mph/166.2km/h

best finish
1/4 time - 10.521s
1/4 speed - 127,7mph/204,4km/h

The 1/4mile ET is exactly the same as our best from 2020. The Victor intake didn't do much of an improvement.

One thing that bugs me is how much resitance the car has when rolling to the line up. It takes alot of energy to get the car rolling. I wonder if one of the brakes is on a little all the time, have to check it out.
Click to expand...

try putting a spacer under the carb, the victor has an unusually small plenum, my 505 liked it -----
 
I think we weigth the car couple years ago. 1250kg w/o driver if I remember correct.

I looked at the bench papers from earlier. I only got the data from when we had the 452 heads on. The AFR was 9.6-10.2 something during the whole pull.
As I don't think we did anything to the carb during the whole test
 
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