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Old 04-05-2010, 12:25 PM
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Edelbrock #1406 Tuning

Tuning my Edelbrock #1406 on my fairly stock 350 using a wide band O2 sensor. Motor is in a '69 C-20. .098" Primary jets, .073" x .042" Primary metering rods, .101" Secondary jets, stock step up springs which I think are yellow. WOT throttle is good 12.5-13 AFR, cruise is good around 14, light acceleration is good around 13. Driving up the hill to my house it goes lean around 15.5 AFR. Haven't put a vacuum gauge on it driving up the hill, but at idle I'm pulling around 20 inches. Should I try some richer step up springs? Trucks drives good now, I'm just concerned about it being lean under load.
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Old 04-09-2010, 10:35 AM
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I would go one larger and see... if you've upped the rest from Edelbrock stock than it stands to reason.

How's your timing? Do you use a vac advance?
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Old 04-09-2010, 11:15 AM
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Quote:
Originally Posted by Sinister
Should I try some richer step up springs? Trucks drives good now, I'm just concerned about it being lean under load.
I believe you're right- I'd go w/orange springs. Let us know how it goes.
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Old 04-09-2010, 11:26 AM
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Timing is 12 BTDC, still have to check total. Running vacuum advance. I'll try the orange springs and see how it goes. Thanks guys.
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Old 04-09-2010, 06:21 PM
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change the rod to a .070x .042 and go to a pink spring with a higher vacuum rating so the rods are lifted sooner (go rich) as you get into the throttle.

If changing the rod does not help, go .002" .003" bigger on primary jet.
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Old 04-09-2010, 06:25 PM
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I'll have to check and see if I have those rods. I'm going to try a spring change first to see where we're at. Numbers are good, just a little lean on that damn hill.
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Old 04-11-2010, 11:11 AM
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Well, tried both orange and pink springs with no appreciable difference. Since my other numbers are so good I'm just going to keep running the yellow springs. I can live with the 15.5 AFR running up the hill, I'm not pinging or anything.
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Old 04-13-2010, 09:43 AM
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Success. Tried some .073" x .037" metering rods and that did it. 14-14.5 AFR coming up the hill.
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Old 04-13-2010, 12:14 PM
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Quote:
Originally Posted by Sinister
Success. Tried some .073" x .037" metering rods and that did it. 14-14.5 AFR coming up the hill.
Too bad most guys don't report back w/their findings like you just did- the forum would be richer, knowledge-wise, if they did.

Thanks.
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