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Old 07-17-2003, 09:58 AM
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Exclamation curve kit tips

can anyone give any tips on a curve kit installation. my 400sbc keeps getting higher in time with more rpms.it idles at 5 degrees with the advance undone.it runs great but i need to set the timing so i can play with the carb jetting.

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Old 07-17-2003, 11:20 AM
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idles at 5 degree`s with the advance undone? you mean vacuum advance? you shouldn`t have any vacuum advance at idle, it`s needed at part throttle cruising. your base timing should be 12 degree`s BTDC, with 38 degree`s in by 3000 RPM. the advance is suppose to increase as engine rpm`s go up, however, usually by the time you get the normal advance set the vacuum advance comes in and gives it more than it needs, so in most cases you have to get a adjustable vacuum advance or limit your own.
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Old 07-17-2003, 12:47 PM
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i know how it works. my question is what spring weights will let me get more or less initial timing.if you have any type of advance it has to be disconneted before you can determine base timing.whether it be by vacuum ,computer controlled,or mechanical.i'm not trying to be rude but my question is about a curve kit in a vacuum advance dist.

i do appreciate your response.but i may have been misleading in my post. thanks kellogs

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Old 07-17-2003, 03:09 PM
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The spring weights are usually color coded depending on which manufacturer made the kit. I recurved mine by trial and error. I had a buddy that gave me a handfull of springs. I used a timing light with the advance knob and a tach. The stiffer the spring the later the advance. I have a 3/4 ton truck on propane so I needed more initial and more advance earlier . I ended up using two different springs to get what I was happy with.

Hope that helps.
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Old 07-17-2003, 04:00 PM
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I've found the medium springs work out pretty good in a 350.
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Old 07-17-2003, 06:20 PM
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I was mislead by your post. with the vacuum advance set at ported vacuum it`s not pulling any vacuum at idle, I can disconnect mine at idle or leave it on and the base setting stays the same.
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