502 Timing - Chevelle Tech
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post #1 of 3 (permalink) Old Dec 12th, 09, 6:53 AM Thread Starter
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502 Timing

Doing some tuning on 502 crate engine and need some assistance. I see on GM's website they say 36 degrees at 3600 rpm of total timing. What are most of you running for initial timing? The website doesn't say.
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post #2 of 3 (permalink) Old Dec 12th, 09, 7:29 AM
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Re: 502 Timing

Start with 16-18. The more initial you can get without detonation the better. My 454HO likes 18 initial.


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post #3 of 3 (permalink) Old Dec 12th, 09, 11:38 AM
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Re: 502 Timing

With vacuum advance disconnected, set the total at 36. Then if you let it idle, you'll see that its at or near 16. Be sure the idle speed is slow enough that you're not starting the mechanical curve (around 800-900 should work) "Most" distributors have about 20 of mechanical advance in them, some a little more, some a little less. You adjust the rpm level with springs and bring the total in earlier or later. You can play with weights if needed to get the 20 you'll need. You may also find that you need to limit the vacuum advance depending on your application. There are also adjustable advances and limit cams for this purpose.

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