How much Vacuum should I have?
#1
Racer
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Member Since: Apr 2006
Location: Twinsburg OH
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How much Vacuum should I have?
It looks like stock should be about 20 to 22 inches. My car is modified but 10 inches seems real low. I have an LT1 with Lloyd Elliot level 2 ported stock heads and 1.6 cam with supporting mods.
#3
Safety Car
It is not unusual for modified engines to have 10" of vacuum. A stock engine will be 15" to 18" at idle in park.