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69 340 Dart again...
#1781830
03/17/15 02:06 PM
03/17/15 02:06 PM
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Joined: Jun 2005
Posts: 5,102
Western Md.
skicker
OP
"The Champ"
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OP
"The Champ"
Joined: Jun 2005
Posts: 5,102
Western Md.
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Dad wants to make a few changes to the Dart. Right now it runs right about a 13.20-13.40. Lazy as hell in the 60ft. and pulls real hard thru the higher RPM's.
It's a street car that he's not interested in trying to race but he wants it quicker? He's 75 and I think its fast enough...but he'll get what he wants.
Specs are:
.060 over 69 block with 10.25-1 compression
Eddy alum head with a slight intake port blend job
M-1 intake (single plane)
Racer Brown ST-21 solid lifter camshaft (.254 at .050 .520 lift)
MSD distributor with advance set-up early all in at 2K timed at 36*
750 and 850 Holley little to no difference (would be open to a new 750 Demon)
3500 Convertor
3.23 gear
28" M+H Racemaster Slicks
I know the gear hurts it so I caved and am putting a 3.91 in it.
Still haven't ever checked the cam timing but plan on it in a few weeks. It feels like it needs advanced to me.
I want to degree it in and put a LD 340 intake (Dual plane) on it and leave it alone.
He saw where Racer Brown sells the 1.5-1.6 rocker kit and wants to put it in. The cam is already too big...I'm not sure this will help.
I'm not going to change the cam, convertor or heads.
This build was done using a bunch of good parts I already had...now I want to get the most out of what's here.
What say you?
Thx Guys...
...FAFO...
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Re: 69 340 Dart again...
[Re: skicker]
#1781832
03/17/15 02:17 PM
03/17/15 02:17 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Well your putting in more gear.. thats gonna help.. check the cam... advance it some.. does the conv really stall at 3500.. you can get that tweeked if needed.. the dual plane intake will help also 
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Re: 69 340 Dart again...
[Re: MR_P_BODY]
#1781833
03/17/15 03:16 PM
03/17/15 03:16 PM
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Joined: Jan 2003
Posts: 1,009
Richmond Twp. Mi.
Mr340
super stock
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super stock
Joined: Jan 2003
Posts: 1,009
Richmond Twp. Mi.
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With that cam and 28" tires a 4.30 gear would really wake it up  What's the MPH thru the traps? Try the 3.91 and a dual plane with the 750 for starters.
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Re: 69 340 Dart again...
[Re: skicker]
#1781836
03/17/15 03:47 PM
03/17/15 03:47 PM
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Joined: Feb 2009
Posts: 1,532
off the grid
340B5
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,532
off the grid
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That cam really needs 4.56-4.88, and 4800-5000 converter, but I understand your choices. The only thing I could think is to try backing off on the total timing a couple degrees( 1 deg at a time). The LD-340 and 3.91's will help quite a bit.
Yeah, it's got a smallblock.
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Re: 69 340 Dart again...
[Re: MR_P_BODY]
#1781837
03/17/15 03:53 PM
03/17/15 03:53 PM
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Joined: Jun 2005
Posts: 5,102
Western Md.
skicker
OP
"The Champ"
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OP
"The Champ"
Joined: Jun 2005
Posts: 5,102
Western Md.
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Mike, The convertor seems a little tighter than 3500. I attributed that to the intake and cam not allowing it to make good torque. I hoped with the gear change it will loosen the convertor up by raising the RPM's. If the convertor does truly work on torque...and this combo doesn't build much...if more torque was introduced wouldn't it stall a little higher? That was the reasoning I used for an intake swap...  Originally I didn't want to do a gear change as I thought it was a band aid and I was just covering up the real fix. I thought if I could make it run as good as possible with the 3.23's... then changed to the 3.91's it would be that much better.
...FAFO...
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Re: 69 340 Dart again...
[Re: skicker]
#1781838
03/17/15 03:59 PM
03/17/15 03:59 PM
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Joined: Jan 2003
Posts: 660
River Falls, WI
urdustd
mopar
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mopar
Joined: Jan 2003
Posts: 660
River Falls, WI
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A Racer Brown ST-21 is 254@0.050" and 0.520 lift. That cam needs lots of lead, start with at least 20* of initial timing. The dual plane intake and 3.91 gear will help tremendously in getting it out of the hole.
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Re: 69 340 Dart again...
[Re: skicker]
#1781840
03/17/15 04:26 PM
03/17/15 04:26 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Mike,
The convertor seems a little tighter than 3500. I attributed that to the intake and cam not allowing it to make good torque. I hoped with the gear change it will loosen the convertor up by raising the RPM's.
If the convertor does truly work on torque...and this combo doesn't build much...if more torque was introduced wouldn't it stall a little higher?
That was the reasoning I used for an intake swap...
Originally I didn't want to do a gear change as I thought it was a band aid and I was just covering up the real fix.
I thought if I could make it run as good as possible with the 3.23's... then changed to the 3.91's it would be that much better.
Your correct... more torque it will stall higher..
so yes if you can built more torque it will go up..
the gear is a torque multiplier also but thats after
the conv
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Re: 69 340 Dart again...
[Re: gtsdude]
#1781842
03/17/15 04:51 PM
03/17/15 04:51 PM
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Joined: Jun 2005
Posts: 5,102
Western Md.
skicker
OP
"The Champ"
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OP
"The Champ"
Joined: Jun 2005
Posts: 5,102
Western Md.
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Fuel pump is a Holley...I think 6-7 psi with new -6 braided lines and a 3/8" sending unit. All lines for fuel and Transmission are AN.
...FAFO...
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Re: 69 340 Dart again...
[Re: crackedback]
#1781845
03/17/15 08:39 PM
03/17/15 08:39 PM
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Joined: Oct 2009
Posts: 1,267
North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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If you put 3.91 gears in it the convertor will be tighter. I put a 3.50 gear in my D50 (Did have 4.56) and the convertor stalled a lot more. At the time it went from 6.34 (4.56 gear) to a 6.39 (3.50 gear)in the 1/8.
I guess the convertor stalling more kept it from not slowing down to much.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: 69 340 Dart again...
[Re: 340B5]
#1781846
03/17/15 10:17 PM
03/17/15 10:17 PM
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Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
rickstershemi
master
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master
Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
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Quote:
That cam really needs 4.56-4.88, and 4800-5000 converter, but I understand your choices. The only thing I could think is to try backing off on the total timing a couple degrees( 1 deg at a time). The LD-340 and 3.91's will help quite a bit.
 At Least 4.56.....what does the car weigh...????
My Challenger at 3200 lbs with 4.56 a similar 340 build (different cam) with worked X-Heads and a 750dp ran a best of 11.2 @ 117 in the 1/4....6700 at the stripe.
Rickster
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Re: 69 340 Dart again...
[Re: rickstershemi]
#1781847
03/17/15 10:42 PM
03/17/15 10:42 PM
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Joined: Jun 2005
Posts: 5,102
Western Md.
skicker
OP
"The Champ"
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OP
"The Champ"
Joined: Jun 2005
Posts: 5,102
Western Md.
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It's basically curb weight with the heater box removed and aluminum heads. It had 4.56's in it for about a week. HATED IT  And yes it does run much better.  I followed him back from a show about 60 mph for about 12 miles.  I could've brained him running it that hard.  He doesn't hear real well and must not pay any attention to the tach. I'm trying to nail down a better combo with whats there. He gets out on the interstate and runs 70-75 with it now with the 3.23's. I'll have a hard time breaking him of that with the 3.91's. No one has really addressed changing the rockers from stock 1.5's to a 1.5-1.6 combination. Wouldn't that technically make the cam seem bigger?
...FAFO...
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Re: 69 340 Dart again...
[Re: skicker]
#1781848
03/17/15 10:48 PM
03/17/15 10:48 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
It's basically curb weight with the heater box removed and aluminum heads.
It had 4.56's in it for about a week. HATED IT And yes it does run much better.
I followed him back from a show about 60 mph for about 12 miles.
I could've brained him running it that hard.
He doesn't hear real well and must not pay any attention to the tach. I'm trying to nail down a better combo with whats there. He gets out on the interstate and runs 70-75 with it now with the 3.23's. I'll have a hard time breaking him of that with the 3.91's.
No one has really addressed changing the rockers from stock 1.5's to a 1.5-1.6 combination.
Wouldn't that technically make the cam seem bigger?
It doesnt need more cam.. its too much right now but
with your changes it can help it... you need to look
at what that cam is installed at.. if you can advance
it 4*
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