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Classic Mustangs Talk General Discussions

General discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustangs. Discuss all non-technical topics related Vintage Mustangs here.

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Unread 08-19-2013   #1 (permalink)
supeg is offline Rookie


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Default Need Some Help With Timing/carb Settings 1973 Mach 1 351c

Hey guys. Have had my 1973 Mustang Mach 1 for approx 10 years. Last couple of years I have been really busy with my new family and have barely had any time to take it out at all. It seems to have issues with Timing and Carb (Runs real rich).

I used to take my Mustang to Classic Car shops in the past for stuff like this but they have gone under. I am pretty mechanically inclined but more towards the newer stuff, but eager to learn.

Here are the specs on the Car.

1973 Mustang Mach 1
351C Q code 4V .30 over bore
Aftermarket Comp Cam
Long Tube Headers
3.0 inch exaust with Flowmasters
Holly 750 Double Pumper
4.11 Rear end
Manual

I have included some pictures at the bottom of this post showing some of the specs of the items in the vehicle.

Basically I need help setting the Carb and the Timing. I have never done the timing and will be buying a timing light. Do I set it at Idle and what degree's do you guys think would work and how do I actually do it.

The Car runs rich as well and would like some help with tuning the carb.

I apprecate any and all help you guys could give me. Again, I have a young family and cannot really afford a shop so trying to learn and figure this stuff out on my own.


https://dl.dropboxusercontent.com/u/...816_184045.jpg
https://dl.dropboxusercontent.com/u/...816_184408.jpg
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Unread 08-20-2013   #2 (permalink)
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Quote:
Originally Posted by supeg View Post
Hey guys. Have had my 1973 Mustang Mach 1 for approx 10 years. Last couple of years I have been really busy with my new family and have barely had any time to take it out at all. It seems to have issues with Timing and Carb (Runs real rich).

I used to take my Mustang to Classic Car shops in the past for stuff like this but they have gone under. I am pretty mechanically inclined but more towards the newer stuff, but eager to learn.

Here are the specs on the Car.

1973 Mustang Mach 1
351C Q code 4V .30 over bore
Aftermarket Comp Cam
Long Tube Headers
3.0 inch exaust with Flowmasters
Holly 750 Double Pumper
4.11 Rear end
Manual

I have included some pictures at the bottom of this post showing some of the specs of the items in the vehicle.

Basically I need help setting the Carb and the Timing. I have never done the timing and will be buying a timing light. Do I set it at Idle and what degree's do you guys think would work and how do I actually do it.

The Car runs rich as well and would like some help with tuning the carb.

I apprecate any and all help you guys could give me. Again, I have a young family and cannot really afford a shop so trying to learn and figure this stuff out on my own.


https://dl.dropboxusercontent.com/u/...816_184045.jpg
https://dl.dropboxusercontent.com/u/...816_184408.jpg
You can start here with Carb Tuning: Carburetor Installation & Tuning Segments | Holley TV

If you are just looking for a better response and a more enjoyable ride, I would stick with 12-16 degrees BTDC on the timing. Plug gap and points gap, points should be gapped at 0.019-0.021 unless you have electronic ignition. The plugs with a stock coil should be at .033 and with a slightly hotter coil up to .045. Hope this helps. If you use a vacuum gauge make sure you adjust the readings for the elevation you're at.
The above should get you going and I'm sure there are others that have the 351C and will chime in as well. Good Luck

Jeff
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Unread 08-20-2013   #3 (permalink)
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Default Need Some Help With Timing/carb Settings 1973 Mach 1 351c

Hello supeg,
FIRST - Welcome to the forum. You will learn a great deal here.

I would like to offer a few THOUGHTS before you get into working on
the motor.
1. - You have some good looking parts in the motor and it should run well.

2. - IMPORTANT - -Today's gas is terrible for sitting. I always add a fuel
treatment like "Stable Green" or Sea Foam. Both of these products are
available at parts stores and places like Wall-MArt
The shelf life of todays gas is VERY short about 40 days.
So if your car sits for a month or so - -you could be getting gummed/varnished
passages in the fuel system.

3. - Checking timing is always a good idea of course - -BUT normally timing
will not change unless there are major issues such as a stretched chain BUT
the POINTS - -will affect timing as well. I point this out because you MAY want
to check a few other things as well.

4. - What type of set-up in the distributor? Do you have points or a pick-up module.
It is OK if you are unsure - - you could post a picture of under the cap and we can help. It is POSSIBLE - the contacts on the points are dirty and or sticking.


MY advice to start with is - - - add some fuel conditioner and some high octane
gas like High Test and drive the car for an hour and see how she acts after that.
Then would be the time to start adjusting the carb. Holleys are GREAT and VERY
easy to adjust.


If you check the timing - -be VERY careful with moving parts such as the belts
and pulleys. It is NOT dangerous if done CORRECTLY. You will be checking
timing with the motor at idle.

Before doing too much - please let us know how old the gas in the tank is.
Then we will be happy to help you with a course of action

Print Dad
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Unread 08-22-2013   #4 (permalink)
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https://dl.dropboxusercontent.com/u/..._resized_1.jpg

https://dl.dropboxusercontent.com/u/...02_resized.jpg

https://dl.dropboxusercontent.com/u/...57_resized.jpg

Here are pics of Distrib i think
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