Good afternoon,

I recently got a project car. I was told it is a Chevy 350 crate with the 383 Stroker kit. It has been very sluggish when I floor it. I checked the vacuum and it’s very low, bouncing between 8-10 inches. I have tried all three ports on the edelbrock 1406 carb and same vacuum. However, when revved to about 2k rpm, it goes to a steady 20ish. I sprayed carb cleaner to try and find a leak but nothing. I also tried adjusting the timing by finding the highest vacuum but that didn’t change anything at idle. What should I check?

Thanks!

 

Two things come to mind, cam with a lot of overlap, or a improperly installed cam.

 

One heck of a vacuum leak, with what you post, you should be able to hear it. I'd suggest looking at the carb base gasket.

 

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