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For a 6L LS, single Precision 76 75. 12 psi. Holley Terminator Xmax.
One popular option is to vent to atmosphere. Great for engine seals as the crankcase will never see pressure.
How about for a street car that I want to have like a PCV system that evacuates the crankcase vapors?
If you have vacuum pulling dirty air through a catch can of one side with a check valve, then a inlet in the other side pulling from fresh, filtered and metered air in the air inlet tube before the throttle body. How to vent the crankcase during boost?
I run a line from the PCV valve to a cheap oil sep, from that to a ck valve (I run boost) then to the intake. See a little oil in it now and then, so its not going in the engine. I also add a filter on the P/S oil filler.
Curious, who's front drive setup is on your engine, I like it.
Last edited by forcd ind; Oct 3, 2023 at 07:48 AM.
It looks like Holley’s setup. It mounts everything to the water pump. The WP uses a a LT1 (Gen V) waterpump cartridge. A new one will be any parts store OR local Dealer
Mighty Mouse makes a great PCV catch can, one their "Wild" series would work great.
Pulls vacuum while at idle or cruise, then closes and vents to atmosphere under boost.
I ran one for years on my last car, 5.7 LS1, 7875 turbo on 14 lbs.
Something with a -10AN or -12AN for the vent side would work great and give you room to turn it up later.
I currently run a vent to atmosphere can and it works well too, just don't mount it too close to the firewall to avoid the oil smell.
I changed my setup to a single can that pulls from the valve cover to my air intake tube just behind the air filter. Works perfectly. Similar to how it is shown in my linked post above. It catches water and oil vapory stuff, I empty 300ml every 500-1000 miles.
The front drive is a kit from Holley called a mid mount. This is all going into an 87 Grand National and cutting the frame for ac compressor clearance was not an option. The idea of using 25 year old power steering pump, compressor did not appeal to me either. So a pile of $$ came out and made this happen.
That Arrington write up was solid. Thanks for the replies.
Not sure of my plans on the OEM pipes. Replies like from above are just bs we do not learn from. ******, do you think this is Yellowbullet?
Those factory little pcv outlets are undersized for boost.
I'm running -10 AN lines to a vented catch can in the nose. I'm making 15-23 psi at the moment. I'm running flipped valve covers, this is how I have the passenger side plumbed.
If you can score a valve cover with the removable PCV valve(early truck I think), it just so happens to be 3/4" ID, so I am planning on stuffing a 3/4" barb in there and then running 3/4" hose to the intake side of turbo with a catch can when I go turbo this winter. Hope it works!
I use the stock PCV valley cover with a catch can, check valve type pcv valve and back to the intake. I vent both of my valve covers with -10(or larger) to a breather tank, You need this type of flow on a big power setup. This can cause issues with MAF cars so some tuning around the unmetered air might be required(it's no different than an oil cap filter etc it's just cleaner). I also like keeping PCV under vacuum as it controls the blowby smell and cleans up the crankcase a bit under light load conditions.
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PCV for turbo 
