Quote:
Originally Posted by caSStro18
Is there an air/oil separator? I have not heard that our cars have one. There is just a short tube that goes from the crank case to the intake as far as I know anyway. This is why some people add a catch can.
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The LT1 engine has a “clean-side” separator connected to the valve covers that drains back into the block. It is referred to as the “clean-side” because it feeds fresh air from the air intake tube (behind the MAF) to the valve covers. If you replace part or all of this system with an aftermarket air filter you can change the air/fuel ratio because you’re allowing the engine to draw unmetered air (not measured by the MAF) into the intake manifold.
There is a separate PCV hose running from the block to the intake manifold. The PCV hose is the on “dirty-side” and draws the contaminated fumes (oil, fuel, and moisture) from the engine into the intake manifold. This is where you would install an aftermarket catch can if you want one.