6066 (1960-1966) GMC Truck Club - 305E Vacuum Readings

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- - 305E Vacuum Readings (https://6066gmcclub.com/showthread.php?t=48122)

Quigley

March 30th, 2014 07:28 PM

305E Vacuum Readings

I just finished putting a 500 Holley on and was setting the idle jets with a vacuum gauge. The most I could get was a whisker over 15 in vacuum at idle. The motor has about 800 miles since complete overhaul, and I was using a SnapOn gauge. Does that sound about normal for a 305? Thanks, Dave

Funky61

March 30th, 2014 10:50 PM

Re: 305E Vacuum Readings

Seems low Quigley, I have about 20 on mine, stock except the Holley.

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