>>It suggests a decrea
>>It suggests a decrease in oil seepage and possible increase in HP,<<
I will agree that reducing crankcase pressure would reduce the possibilty of seal leakage where pressure is an actual contributing factor, and I have seen plugged up crankcase pressure systems blow seals and cause a huge oily mess....on street engines with rings in good condition I have to wonder how much "relieving" is neccesary beyond what the factory already took into account with the original design?
Again on the HP issue I agree in theory (and in practice on race engines) that reducing CP can or does allow a HP increase. How much depends on many factors, but I'd guess on a street engine maybe 1% at 6K-7K rpms.
So then the question becomes, it's certianly not hurting the engine, and may be marginally helping, so what is that worth in terms of $$ invested?