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Discussion Starter · #1 ·
besides a vacuum leak, what would cause sporadic vacuum drops of about 1 to 2 inches during idle at 1000 rpm? SBF with small cam. Could it be rings? I just rebuilt the motor from top to bottom. Thanks.
(pressure reads about 150 to 160 for each cylinder)
(vacuum is 12 -13 inches with a occasional drop to 10-11 inches about every 2 seconds)
 

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its not your valves, rings or head gasket which is a GOOD thing cause anything else is cheap lol

IAC possibly as mentioned but most likely a vacuum leak
get some carb cleaner and spray away
 
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