I'm trying to diagnose a possible vac. leak. I hear ocasional hissing at the vac. distrubution block on the flowzilla intake and having a tough time lowering my idle. At idle 836 rpm(data logged with tweecer RT) my vaccuum guage reads 18mm hg. This is on a stock 5.0L long block 90mm TB, 90mm LMAF, 42 inj.
If anybody running a similar combo can verify a similar vaccuum at idle it would be appreciated. :) Or tell me their vac. with a stock cam.