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Old 08-28-2010, 04:15 PM
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Running Lean...should I look for something else.

Hello guys and gals-

I know, not another carb/running lean question...SORRY!

I need help. I have a 350 with the Edelbrock power package top end kit (Performer RPM heads, cam, and air gap intake) with a Holley 650 DP with total timing on 34. I decided that today I was going to work on the carb and I have 78 primary jets and 80 secondary and a 4.5 power valve (9 vaccum at idle). I took the car out and she still feels weak, not as good as I think she should run I should say. I come home after a few hour drive and check the plugs and they are ashy gray color on the plugs.

Is there any reason I should still be running lean with the jets I have in it? Could I have another problem like a leak or something else? I have more jets and can change them but I want to make sure I am going in the right direction first.

Thanks for the help!

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Old 08-28-2010, 05:31 PM
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With 78 and 80 jets in the carb there is no way you are lean, plugs would be bone white if you were lean. Very light gray, or very light tan, to almost white is what you want to see with pump gas.

You really can't check plugs for jetting after a cruise, all you will be reading is the idle and transition circuits mostly.

The only way to do it is a "plug chop". Put a new plug in one hole and make a WOT 1/8-1/4 mile pass and kill the ignition right at the finish line-no idle time, it will "dirty" the plug Come to a stop and then pull the plug for examination with a magnifier, so you can see down into the plug to the base of the porcelain. You are looking for the fuel ring around the porcelain down near where the porcelain meets the case.

I would be looking for problems elsewhere, if anything you are likely too rich on the primary side now.

What are your initial and total mechanical advance timing specs?? and vacuum advance added amount??
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Old 08-28-2010, 07:01 PM
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Initial is 12 and total would be 36

I replaced the fule pump today with a high flow (110gph) pump and checked all the fuel lines, I did not find any issues...

I will check the plugs using the plug chop method. Thanks for the tips
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