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'73 Fury upgrade - asking for help and recommendations #1278952
08/04/12 06:32 AM
08/04/12 06:32 AM
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HemiFury1973 Offline OP
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Hi Guys,

I have 1973 Plymouth fury Gran Sedan 400/727 that i want to upgrade to have more power and especially throttle response.
I would like to change carb to Hollry 4bbl and of course change the intake manifold, camshaft and timing set.
I don't know which configuratios to choose and i would appreciate your help and recommendations.

Regards,

Hemi (Yes, this is my name)

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Re: '73 Fury upgrade - asking for help and recommendations [Re: HemiFury1973] #1278953
08/04/12 07:50 AM
08/04/12 07:50 AM
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Out in Left Field, NY
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bobs66440 Offline
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What carb do you have on it now? 2bbl?

A small Edelbrock 4bbl (600 or 650) on a Edelbrock Performer intake will help some along with some headers.

I wouldn't go throwing a cam at it without knowing exactly what's in it now for pistons, compression ratio, etc. You could really kill the power that way.

Re: '73 Fury upgrade - asking for help and recommendations [Re: bobs66440] #1278954
08/04/12 08:50 AM
08/04/12 08:50 AM
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HemiFury1973 Offline OP
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Quote:

What carb do you have on it now? 2bbl?

A small Edelbrock 4bbl (600 or 650) on a Edelbrock Performer intake will help some along with some headers.

I wouldn't go throwing a cam at it without knowing exactly what's in it now for pistons, compression ratio, etc. You could really kill the power that way.




Thank you.
For now i have 2bbl Holley. I don't know the rest details.
So can i for now vhange only the carb and intake and later add a mild cam (Lunati 60302 for instance)?

Last edited by HemiFury1973; 08/04/12 08:52 AM.
Re: '73 Fury upgrade - asking for help and recommendations [Re: HemiFury1973] #1278955
08/04/12 10:36 AM
08/04/12 10:36 AM
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Lincoln Nebraska
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RapidRobert Offline
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Welcome aboard! For starters I'd change the timing gear set to a new one with multiple 4 deg keyways & advance it 4 degrees and tweak the dist: set initial with vacuum gauge method/shorten slots to 38 total (no vac)/toss heavy spring/replace it with a light one/plug in vac adv & turn it CW with a 3/32" allen wrench to make it come in sooner. '73 model year was a terrible one for emission regs & you could go richer on the 2bbl jets. This'd give you a good boost without alot of down time.


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Re: '73 Fury upgrade - asking for help and recommendations [Re: RapidRobert] #1278956
08/04/12 07:17 PM
08/04/12 07:17 PM
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Central NC
gch Offline
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First thing I would do is dual exhaust.2.25 or 2.5 pipe.
Then richen up the jets or install a small 4 bbl of your choosing.
Getting lighter advance springs in the distibutor will help acceleration.
Running a 160 or 180 thermostat will help it run cooler and make good power.
A cam is not necessary but if you do it go small.400's don't make a lot of low end and a big cam will leave you disappointed.
Finding your rear gear ratio will help you determine the best mods.
A well tuned 400(new plugs,good wires,and distributor work will make a huge difference and give you a solid foundation for any mods.

Nice car BTW.

Re: '73 Fury upgrade - asking for help and recommendations [Re: gch] #1278957
08/05/12 03:09 PM
08/05/12 03:09 PM
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HemiFury1973 Offline OP
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Quote:


Finding your rear gear ratio will help you determine the best mods.



Thank you.
How can i find the gear ratio?

Re: '73 Fury upgrade - asking for help and recommendations [Re: HemiFury1973] #1278958
08/05/12 03:51 PM
08/05/12 03:51 PM
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Lincoln Nebraska
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RapidRobert Offline
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jack 1 rear tire just off the ground and place gearshift in neutral. put tire valve stem at 6 o'clock then rotate tire 2 revolutions & count # of driveshaft turns, ie 2&3/4 turns is 2.76. If you have a sure grip jack both rear tires just off the ground and rotate them 1 revolution & count the driveshaft turns


live every 24 hour block of time like it's your last day on earth
Re: '73 Fury upgrade - asking for help and recommendations [Re: RapidRobert] #1278959
08/06/12 08:48 PM
08/06/12 08:48 PM
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Central NC
gch Offline
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It may still have the factory tag with the ratio stamped on it.

Re: '73 Fury upgrade - asking for help and recommendations [Re: HemiFury1973] #1278960
08/07/12 12:04 PM
08/07/12 12:04 PM
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
patrick Offline
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Quote:

Quote:

What carb do you have on it now? 2bbl?

A small Edelbrock 4bbl (600 or 650) on a Edelbrock Performer intake will help some along with some headers.

I wouldn't go throwing a cam at it without knowing exactly what's in it now for pistons, compression ratio, etc. You could really kill the power that way.




Thank you.
For now i have 2bbl Holley. I don't know the rest details.
So can i for now vhange only the carb and intake and later add a mild cam (Lunati 60302 for instance)?




assuming it's a 2.76ish rear, I'd probably look at the voodoo 60301


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Re: '73 Fury upgrade - asking for help and recommendations [Re: gch] #1278961
08/07/12 02:23 PM
08/07/12 02:23 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

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Posts: 24,562
Brookeville, Md
On t he cheap I'd call summit and grab the smaller 455 cam and a T-chain set. I'd also run some dual exhaust and up the rear gear to 3.23. As for intake I'd try and find a DP4B or Holley SD. I'd run a 4 hole 1/2" spacer and a small holley or 625 carter. That should wake it up plenty and it won't hurt your mpg...if that's a concern.


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Re: '73 Fury upgrade - asking for help and recommendations [Re: Mr.Yuck] #1278962
08/07/12 06:26 PM
08/07/12 06:26 PM
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furious70 Offline
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Holley SD intake will take all the low end torque away, I tried it several different ways on my 383. In the great intake dyno test it was down something like 30ft lbs @3000rpm to a dp4b, imagine how bad it was way down low.

when it was still NA and carb'ed, my car had a lot more grunt from an idle with the stock intake and 3.23's then it did with the SD and 3.91's.


70 Sport Fury
68 Charger
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Re: '73 Fury upgrade - asking for help and recommendations [Re: furious70] #1278963
08/07/12 07:56 PM
08/07/12 07:56 PM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
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Posts: 24,562
Brookeville, Md
Quote:

Holley SD intake will take all the low end torque away, I tried it several different ways on my 383. In the great intake dyno test it was down something like 30ft lbs @3000rpm to a dp4b, imagine how bad it was way down low.

when it was still NA and carb'ed, my car had a lot more grunt from an idle with the stock intake and 3.23's then it did with the SD and 3.91's.




did you have the open or dual plane SD? i was talking about the low profile dual plane

Re: '73 Fury upgrade - asking for help and recommendations [Re: HemiFury1973] #1278964
08/23/12 02:54 PM
08/23/12 02:54 PM
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HemiFury1973 Offline OP
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Thanks.

The gear ratio is 2.71...

What next? :-)

Re: '73 Fury upgrade - asking for help and recommendations [Re: HemiFury1973] #1278965
08/23/12 08:08 PM
08/23/12 08:08 PM
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dogdays Offline
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The '73 is BUILT rich, the 2-barrel is choking the engine.

Ditch the 2-barrel and the carb. Buy a new Holley 670 Street Avenger and an Edelbrock Performer RPM.

A 400 is basically a larger bore 383 with low compression. You can definitely go too big, again I say the second Voodoo cam from the smallest would do all right.

Get your exhaust system right. If you can't find HP exhaust manifolds for it you can use the low perf ones but go to 2 1/2" system from manifold to rear end, using two Dynomax 17748 or 17749 Hemi Turbos. Be sure to put in an H-pipe, that's a pipe connecting the exhaust pipes to each other, should be the same diameter and as far forward as will fit.

With all my changes you'll pick up at least 50 hp with no decrease in fuel mileage, probably an increase. The car will feel completely different. It's amazing what a simple 4-barrel swap can do.

R.

Last edited by dogdays; 08/23/12 08:12 PM.
Re: '73 Fury upgrade - asking for help and recommendations [Re: dogdays] #1278966
08/24/12 03:11 PM
08/24/12 03:11 PM
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HemiFury1973 Offline OP
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Quote:

The '73 is BUILT rich, the 2-barrel is choking the engine.

Ditch the 2-barrel and the carb. Buy a new Holley 670 Street Avenger and an Edelbrock Performer RPM.

A 400 is basically a larger bore 383 with low compression. You can definitely go too big, again I say the second Voodoo cam from the smallest would do all right.

Get your exhaust system right. If you can't find HP exhaust manifolds for it you can use the low perf ones but go to 2 1/2" system from manifold to rear end, using two Dynomax 17748 or 17749 Hemi Turbos. Be sure to put in an H-pipe, that's a pipe connecting the exhaust pipes to each other, should be the same diameter and as far forward as will fit.

With all my changes you'll pick up at least 50 hp with no decrease in fuel mileage, probably an increase. The car will feel completely different. It's amazing what a simple 4-barrel swap can do.

R.




Thank you so much.
But will 670 not be too big for the engine?
And the intake - Edel brock rpm will be better than weiand with the Holley carb?


Hemi

Re: '73 Fury upgrade - asking for help and recommendations [Re: HemiFury1973] #1278967
08/24/12 03:39 PM
08/24/12 03:39 PM
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HemiFury1973 Offline OP
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So, what should i choose?

carb: Holley 570 or 670?

Intake manifold: Weiand 8008 or Edelbrock performer?

Thanks,

Hemi

Re: '73 Fury upgrade - asking for help and recommendations [Re: bobs66440] #1278968
08/25/12 01:03 PM
08/25/12 01:03 PM
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HemiFury1973 Offline OP
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Quote:

What carb do you have on it now? 2bbl?

A small Edelbrock 4bbl (600 or 650) on a Edelbrock Performer intake will help some along with some headers.

I wouldn't go throwing a cam at it without knowing exactly what's in it now for pistons, compression ratio, etc. You could really kill the power that way.




The compression ratio is 8.2, rear end 2.71.

Re: '73 Fury upgrade - asking for help and recommendations [Re: HemiFury1973] #1278969
08/25/12 08:58 PM
08/25/12 08:58 PM
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Central NC
gch Offline
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Performer and 570 if you are keeping the 2.71 gears.

Re: '73 Fury upgrade - asking for help and recommendations [Re: gch] #1278970
10/15/12 03:12 PM
10/15/12 03:12 PM
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HemiFury1973 Offline OP
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So, at last I bought a 670 street avenger holley carb along with weiand action plus intake manifold and a new mopar performance ignition kit and new plugs. Now it's time to put all them on :-)

Re: '73 Fury upgrade - asking for help and recommendations [Re: HemiFury1973] #1278971
10/15/12 04:40 PM
10/15/12 04:40 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

and a new mopar performance ignition kit


If it comes with an orange box I would suggest keeping a spare 4 pin ECU in the glove box. Your parts house has em for cheap. I'm assuming you already have electronic ign. I'd get a hotter coil/ballast. I use a FBO coil and MP 1/4 ohm ballast and OE ECU & it starts/runs awesome. the power is pretty much from the coil/ballast combo & not the coil primary switcher (ECU) but people are raving about FBO's new ECU. EDIT If needed there is a pentastar ECU harness/pigtail assy for $28 in the BB for sale section page 6 which may or may not come with the 2 terminal nominal 1.25 ohm ballast but was not shown in the pic

Last edited by RapidRobert; 10/15/12 05:13 PM.

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