HS-MotorsportsDallas
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i get what you are saying and it also depends on what material is being used as a filter.. i spent a few years helping a guy build a few bbc motors that delt with steve morris racing out of michigan and we found that it needs and benefits it to have some sort of vacuum on it..
live life full throttle
Yeah but that's on a gas motor with low tension rings. These motors don't run low tension rings.
I agree that a motor will run better with vacuum in the crankcase but I'm simply stating that these motors don't require vacuum and most properly sized catch cans won't hurt anything.