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Old Jul 1st, 07, 01:41 PM
xtratuff xtratuff is offline

 
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Default Timing for the GM ZZ383

I just installed the ZZ383 in my 68 camaro and am still trying to get the timing set just right. Every time I call GM for advice I get a different answer as to what to set the timing at. Can someone shed some advice on what they have their ZZ383 set at.
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Old Jul 1st, 07, 05:16 PM
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mnm99 mnm99 is offline
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Default Re: Timing for the GM ZZ383

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Originally Posted by xtratuff View Post
I just installed the ZZ383 in my 68 camaro and am still trying to get the timing set just right. Every time I call GM for advice I get a different answer as to what to set the timing at. Can someone shed some advice on what they have their ZZ383 set at.
I believe it stated 32* total with vac advance disconnect. Initial around 15*Here's what I found.http://www.gmperformanceparts.com/En...8772&engCat=sb


As for calling GM...They suck. I emailed them 3 times and never got a response. I tried calling GM performance, GM goodwrench and the headquarters..Nobody could tell me anything. The only awnser I got was to call the dealer I got it at. They also were good for nothing.
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Old Jul 1st, 07, 07:48 PM
Fred Mertz Fred Mertz is offline
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Default Re: Timing for the GM ZZ383

What does GM do to their motors that would require anything but 36 degrees all in by 2800? This figuring 12 initial with 24 in the dist and full vac advance on top of that. Isn't this setup pretty much standard these days for performance motors running on quality gas?

Just wondering why it would be different. Warranty issues?
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Old Jul 1st, 07, 08:16 PM
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Default Re: Timing for the GM ZZ383

Fred from the postings here and my personal experiences with my 383 stroker 34 total seems to be the median total all in between 2800-3000rpm. A shorter stroke sbc seems to run 36 - 38 total. Of course this really depends on cam timing and to some degree gear ratio...
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Old Jul 1st, 07, 09:19 PM
BPOS BPOS is offline
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Default Re: Timing for the GM ZZ383

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Originally Posted by Fred Mertz View Post
What does GM do to their motors that would require anything but 36 degrees all in by 2800? This figuring 12 initial with 24 in the dist and full vac advance on top of that. Isn't this setup pretty much standard these days for performance motors running on quality gas?

Just wondering why it would be different. Warranty issues?
Nope - it's the combustion chamber design. It promotes faster burning of the mixture, hence the term "Fast burn". The Fastburn heads like 32 total - you might be able to sneak it up to 34. Mine runs best at 32.
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Old Jul 2nd, 07, 03:08 AM
Dirt Reynolds Dirt Reynolds is offline
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Default Re: Timing for the GM ZZ383

The 2007 GMPP catalogue says the ZZ 383 timing specs are 10° initial and 32° total.
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