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Discussion Starter · #1 ·
I bought a new Holley 750dp with 69/76 jets and a 6.5hg PV.
The old 3310 had a bad PV and fouled the plugs and it had a 5.5hg PV.
So, I installed new autolite 26's, put the new carb on and it's still running pig rich at idle. Pulled the plugs after 5 minutes of idling and the porcelain is black.
Does the PV size affect idle mixture?
 

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Discussion Starter · #3 ·
My vacuum was about 14-15 last time I checked. It was checked directly at the intake.
 

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Discussion Starter · #4 ·
Found the problem. I had a vacuum leak at the rear intake port. I didn't put thread sealer on the plug which caused the PV to open at idle.
Good call FRDNUT
 
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