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I have a 92 350 SBC with a Edelbrock 1406 carb. In the older days we use to set the timing her in Denver at 2 degrees per 1,000 ft of altitude. So I would run the timing at 10, and maybe at 12. Took the distributor out to replace the intake gasket. Readjust the timing to 8 and not quite smooth as it was before. Ideas of timing for high altitude here in Denver. Thanks guys.

Robert
 

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If you set the timing to,the same as before, you may have another problem. Check for vacumm leaks and adjust carb. Set timing for total timing. It should be about 34-36 degrees total at about 2500 to 2800 rpms.:tu
 

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Sounds like you may have an air leak under the manifold. I have this right now from changing the intake to an Edelbrock RPM. Did you use the rubber seals on each end? I've been told to launch them and use 'The Right Stuff' to seal the gaps each end.
 
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