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i have a chevy 350 engine and i want to add two breathers to my valve covers.?
i was told that i have to have the pcv instead of the two breathers. i have seen it in many magazines where there is no pcv showing at all...whats the good,bad and ugly in this situation?
Don't be fooled by what you see in car rags.
Show cars, and race engines are very diff than your street, or even weekend street/strip car.
You need an in and an out. The PCV and breather does that.. Easiest way to put it.. Breather lets clean air in, and PCV valve lets dirty air and pressure build up out.
With 2 breathers in a milder engine, or one thats ran longer that 1/4 mile pass... You end up having crank case pressure building up.. That pressure will push oil out your breathers, blow oil dipstick out of tube thats in block, etc.
In fact even race engines uses a sort of PCV system.. Most uses 1 of the 2 things.. Pan EV system.. Where you have a breather in each cover, rubber or steel braided line on each breather.. Line ran to the header collectors where a spout is welded on and line hooks to that. Alot of guys will put an oil catch can between that line as well..
Then use the exhaust pressure to suck or draw out the crank case pressure, and exit that built up pressure through the headers.
That system don't work too well on cars with mufflers..
Another race PCV system is 2 breathers, a crank driven vac pump, breather hooked to pump, pump sucking on it to draw out pressure.. Catch can inline to catch oil thats pulled out..
Be smart, and install a PCV valve in one cover, and a breather in the other.. It will work the best for you.
I use that same set up on my 11 second, 500 HP daily driven, weekend raced camaro.. Worked great for the past 4 years for me.
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