[Camaro1973]

Originally Posted by Gunkk

1. Yes, no. Cans will void your engine warranty. So why bother stock as it's all risk no reward. See also #3.

2. Not necessarily as not all crankcase vapors are oil. For example, winter driven short trips make a LOT of water condensate: "chocolate milk" in the can. So weekly empties is entirely reasonable. Whereas long summer cruises down the interstate will make very little condensate in the can, and almost all of it oil (water and fuel will evaporate). Do CC's help keep water/gas out of the crankcase? Maybe, but remember they are stopping it from from being burned at this point, so do they REALLY help? IMO, a weekly Italian tune-up and changing your oil frequently will do more for your car than a catch can in this scenario.

3. My take: "Need" is a matter of opinion more than fact as there has been very little evidence posted anywhere of valve buildup on LT4s. Almost all of the "scare tactics" pictures that I've seen posted by the MFR's are old truck engines. So IMO, yes, unless you're over-boosted or running high horsepower mods, you don't need one on the ZL1.

Bud you ever pull off an Lt1 or lt4 head after 10k miles? They are gunned to hell and back and any shop that does engine work will tell you the same exact thing.