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Old 07-05-2006, 10:47 PM
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HEI curve recomendations.

Tonight I was a bit restless and in the mood to turn some wrenches. So I decided to start the process of "freshening up" the distributor on my Firechicken.

I purchased an advance curve kit from an auto parts store a few weeks ago, and I noticed that it came with three different spring pairs.

First is the "gold" spring, which starts the curve at about a thousand RPMs, hits 15 degrees at 2,000, and tops out at 20 degrees from 4,000 on up.

Second is the "silver" spring pair. It starts it's curve at about 1,800 and tops out at about 15 degrees at 5,000.

Third is the "black" springs. They hold up to about 2,200 RPMs and start their curve up to 10 degrees at 5,000 degrees.

Now, this is my first attempt at monkeying with the distributor. Tonight I installed the "gold" springs to check my work and make sure everything moved smoothly.

Now for my question. Is this the wise choice in keeping the "gold" springs in? Or would one of the others be more of a benefit to me?

My intentions right now are for about 300 horses until I get my Olds 350 heads. I won't be driving this car on a daily basis. But it will for the most part be a cruiser with the occasional shot down the quarter mile.

Thanks for any help!

Whoops!! I forgot to ad that it's the Olds 403...

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Old 07-06-2006, 06:05 AM
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Hard to say without some specifics on your engine combo. Try each and see which one feels best.

Vince
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Old 07-06-2006, 07:34 AM
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Well, I guess that would be the most logical thing to do.

Thanks for the input though!
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Old 07-06-2006, 09:39 AM
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Just a few thoughts.

Did you leave the original weights in the distributor? Most recurve kits come with a set of weights and springs. The curve stated in the instructions apply to the new set of weights. If you kept the old set, the curve may be different.

Use a timing light to see what advance you are actually getting at various rpms.

The usual suggestion is to start with the weakest springs and see if you get any pinging under WOT. If so, step up to the next set of springs.

And you can mix springs. Using one gold and one silver is okay if you need something that falls in between the matched sets.

John
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Old 07-06-2006, 10:14 PM
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Cool. I didn't know that you can mix & match springs.

I did use the new weights, but I kept the old ones just in case I ever needed them. I cleaned them up a bit with WD-40 and a brass brush to clean off the nasties.

The bad part of checking now is the engine is stripped down and waiting for a trip to the machine shop for a bath and some new cam bearings. So right now I can't see how well they will work. Well, there is one way. By brother has a '77 T/A with a running Olds 403...

I think I have a guinea pig...
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