how much pressure is coming out the valve cover?? excessive crankcase pressure comes from blow by from the piston rings

Roy

Answered by ASEMaster6371 (expert)
24,789 answers provided

Dont have a way to measure. It is not pressure but excessive vacuum. Motor only has about 40,000 miles on it. Was a crate engine from GM. Runs great just squeals loudly. Seen this same question numerous times on internet but no answers. Thanks

Response from giiufh
1 question asked

without us seeing it and hearing it, it is very difficult. if you say the noise stops when you take off the oil fill cap. and you say it is a vacuum, you may have a bad intake manifild gasket creating excessive vacuum into the crank case and you hear it from the rear main.

Roy

Answered by ASEMaster6371 (expert)
24,789 answers provided

I believe you have the best answer I have found yet. It is coming from the rear main area. I appreciate this greatly.

Response from giiufh
1 question asked

good luck

Answered by ASEMaster6371 (expert)
24,789 answers provided