Thread: New 496 wont run??

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36Sedan, that was quite a pile of work to put together. Good job on that! Everyone here knows you to be a straight shooter and not someone who would go off on a tangent of some sort... ( unlike .... ME!)
The only thing that I wanted to add to the OP, if and when you get it running again. Install your vacuum gauge while tuning for your idle, NEVER let vacuum go below the setting of your power valve plus a half inch. So if your PV is a 6.5 then don't go below 7 inches of vacuum. The cam may need 12 or 1300 rpm's to maintain that much vacuum. But that's the price of horsepower sometimes. We didn't select the components or know what they installed so can't help you beyond what we've already discussed.

That's why earlier I suggested you remove the power valve and plug it - if things got better, then you can search for a lower numbered valve. Or like me, just leave it out. I don't spin my motor fast enough , long enough, to get lean enough to hurt it. It's a street car. And I freely admit, I don't know you, your engine builder or your personal situation... but the guy who built this needs to be contacted and see if he can help you sort this out. If he's turned his back on you... perhaps others need to be warned of the situation?