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Old May 13th, 2008, 11:59 PM   #1
88mudder
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Default 600cfm carb question

I have an Edelbrock 600 CFM 4 bbl carb with electric choke. The engine is a Ford 302, early 80's. It has the vacumn advance port on the front. My distributer is mechanical, not vacumn advance. Does this mean that i need a vacumn advance style dist since the carb has the port for it? Right now i have the port blocked off since my dist isnt vac advance...help?

Im trying to narrow some stuff down because the engine runs like shit under a medium to heavy load. It runs great at idle and low rpm, starts right up. Im thinking the timing isnt advancing. Any ideas appreciated!

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Old May 14th, 2008, 07:36 AM   #2
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No, you don't NEED a Vac. adv. dist. just cause your carb has a port for it.

Do you have a timing light? If so you can check dist. to see if it is advancing the timing by reving up the motor while you watch the timing marks with the timing light.
you should see the mark move as the rpms increase. How much depends on the dist.
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Old May 15th, 2008, 12:19 AM   #3
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thx for the info.
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Old May 18th, 2008, 12:09 PM   #4
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If you're running on the street a vacuum advance dist is a must. If you are drag racing you don't need a vacuum advance. You need a ported vacuum to the advance. It will have no vacuum at idle. It is easier to find if you have a vacuum gauge.
If you are running an old, duraspark dizzy that has been sitting around the mechanical advance could be seized or broken as well. I use an advance timing light and time by total. Total advance is much more important than initial. If you are running rough in the midrange, you could have to much total advance not to little.
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Old May 18th, 2008, 01:49 PM   #5
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Quote:
Originally Posted by DeRanged mudder View Post
If you're running on the street a vacuum advance dist is a must.
Not entirely true, it is nice as it helps economy but not a must.

Quote:
Originally Posted by DeRanged mudder View Post
You need a ported vacuum to the advance. It will have no vacuum at idle. It is easier to find if you have a vacuum gauge.
Some engines run better with full vac. to the dist., cleans up the idle alot. Any stock style engines I do mostly get ported but any mild builds with a bigger cam run much better with more timing at idle.


Quote:
Originally Posted by DeRanged mudder View Post
If you are running an old, duraspark dizzy that has been sitting around the mechanical advance could be seized or broken as well. I use an advance timing light and time by total. Total advance is much more important than initial. If you are running rough in the midrange, you could have to much total advance not to little.
Correct, I to set timing by the total, and let initial fall where it may.
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