They can IF you don't use a Pcv.
Both to a catch can will be just venting fumes. No Pcv pulling them out.

 

On my new motor I run both sides to vacuum with a catch can.

I found with anything less I had small oil leaks because of crankcase pressure.

 

You don't have any breathers in your set up?
Got any pics?

 

Nope no breathers. All Vacuum all the time.

I change the oil a lot and its not a daily ride.

I dont have any pics at the moment. One catch can is mounted on my brake booster and one is mounted on the front of the passenger head.

 

Ill have my coolant/brather combo tanks this week if you want to wait and see how that works. Its a straight breather tank though, no vacuum source crap haha.

 

i run catch can on drivers side and a breather on passenger side. if i don't run a breather i get oil leak as vortex described

 

I don't think I want a breather tho... This vacuum crap seems like the way to go. no fumes

 

Until you start making real power that is

I never smell fumes on mine for what its worth

 

When I had my Whipple, I never smelled anything either and I didn't run a can. The only time I smelled anything is when I turned my truck into a mosquito sprayer.......


I miss that Whipple....... :/