Truck PCV design is totally different then with a LS1 and 1 purpose of the small orifice was simply to reduce oil loss via this smog device.

It is common for LS1 engines to go through 1 quart oil or more per 1,000 miles and if racing lets say at the drags can use 1 quart in 5-6 passes.

You surely have to see that oil fumes replacing air/fuel into the cylinder would affect the quality of cylinder volume, the effects of that oil buring and causing high carbon buildup in cylinders and piston tops and the ill effect to what makeup the exhaust is as to what 02s are seeling less oxygen content.

Using a lightweight oil such as 5W30 in summer heat and high RPMs is easy to become blowby and out the PCV system.



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