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Old 07-27-2010, 06:34 PM   #1
BlacknGold442
 
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Default olds 403 timing

what should i set my timing degree at on my olds 403 with 350 7A heads
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Old 07-27-2010, 06:35 PM   #2
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Default Re: olds 403 timing

Try 20 at idle to start.
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Old 07-27-2010, 11:01 PM   #3
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Default Re: olds 403 timing

That's what I run mine at.
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Old 07-28-2010, 03:26 AM   #4
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Default Re: olds 403 timing

I'm running at 18*
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Old 07-28-2010, 07:47 AM   #5
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Default Re: olds 403 timing

I can get away with 21 if I can keep it cool. If it get's above 200 F, it will spark knock. I'm running #5's at 9.4 : 1 static
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Old 07-28-2010, 12:04 PM   #6
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Default Re: olds 403 timing

Quote:
Originally Posted by olds307 and 403 View Post
Try 20 at idle to start.
It's not set at idle. You're supposed to set the base timing to 20 @ 1100 rpm.
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Old 07-28-2010, 12:37 PM   #7
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Default Re: olds 403 timing

With the vacuum advance line disconnected and plugged.
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Old 07-28-2010, 01:35 PM   #8
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Default Re: olds 403 timing

I set most stock engines 20* at idle. They all run fine. Olds motors love timing.
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Old 07-28-2010, 01:51 PM   #9
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Default Re: olds 403 timing

Agreed, Olds engines, especially low compression motors like a lot of timing. I realize the 1100 thing but think that is a stupid way to set it.I have seen anywhere from 13 to 22 setting at either 1100 or 2200, I believe. Actually set your base timing to wherever you need to get 34-38 total. My car ran faster at 36 total and that was 15 base at idle. That varies from distributor to distributor too.
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Old 07-28-2010, 03:59 PM   #10
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Default Re: olds 403 timing

Ok what's the difference between base and idle timing?
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Old 07-28-2010, 04:23 PM   #11
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Default Re: olds 403 timing

Quote:
Originally Posted by rdltmc3 View Post
Ok what's the difference between base and idle timing?
Base timing basically is idle timing with the vacuum disconnected. Total timing, includes mechanical advance at high RPMS/WOT, and then there is also the addition of vacuum advance at part throttle.
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