Quote:
Originally Posted by efnfast
Pardon me, and excuse my ignorance. I'm new at this. What is that??? 
 Steve |
A catch can allows for collection of some of the oil vapor that gets past the PCV valves. The LT5 is known for sending a lot of oil that way, which then is drawn into the plenum via vacuum and burned. The catch can allows recovery of some of that vapor, into liquid oil, which can either be disposed of or poured back into the engine.