tonight i hooked up a vacuum gauge to check the vacuum of my intake. its averaging around 10-11Hg at idle. is this pretty normal or should i be looking for a leak somewhere? my MAP seems to be normal, averaging around 66kpa (normal for my car). i cant find any external vacuum leaks anywhere. i would only assume that the vacuum draw on my cam would be less than that of a stock cam (stock average of ~20Hg of vacuum) because of the average stock manifold absolute pressure (34Kpa). does this seem right?

i recently had an intake gasket blow and was pulling in oil from the valley into the heads. i changed out the gasket and retorqued the intake bolts after a heat cycle. i didnt check the vacuum before the blown gasket (didnt know it was blown at the time, took off intake for another reason) so i was curious as to if there is a need for concern. thanks for the help.

 

The idle vacuum should be around that.

Bret

 

Don't lie... no car is EVER completed.