258+2100 what to do with Valve cover breathers? - JeepForum.com
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Unread 02-08-2010, 10:34 AM   #1
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Join Date: Nov 2009
Location: St Louis
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258+2100 what to do with Valve cover breathers?

I recently swapped a 2100 onto my 1985 with the 258.

I also put a Aluminum valve cover on at the same time.

I am using a open element air filter and it of course doesn't have provisions to plumb the pcv and breather line back into the air intake like the stock air cleaner did.

I have one small port under the air filter flange on the carb and even though I would have to choke it down the pcv should be ok there right?

What to do with the vent on the tail end of the valve cover?

Show me some pics of your setups with the 2100 as well. I'd like to see where you routed everything.


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Unread 02-08-2010, 11:58 AM   #2
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1984 CJ7 
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The front pcv hose will go to that fitting on the carb as you described as thats where the carb draws the air out of the valvecover. The rear is a breather allowing air into the valvecover. You'll need to put a little filter or breather into that rear hole to filter the incoming air. Then you should be all good.
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Unread 02-08-2010, 12:19 PM   #3
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1984 CJ7 
Join Date: Jul 2008
Location: Northern Virginia
Posts: 3,783
I thought I had a good pic but can't find it right now. The PCV should be connected to manifold vacuum. I tap into the port near my brake booster. The breather I connect to the port just under the air horn in the back. This supplies filtered air to the crankcase.
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Unread 02-09-2010, 07:47 PM   #4
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1984 CJ7 
Join Date: Apr 2009
Location: durango co
Posts: 200
had rebuilt engine got new valve cover alum type front line is air breather off hose so line has angle on it hose is about 6 1/2 inches put breather on ens of it breathers great also oil flows back into valve cover not pretty but works great
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Unread 02-24-2010, 06:19 AM   #5
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1983 CJ7 
Join Date: Apr 2009
Location: Dayton Ohio
Posts: 81
I bought a little crankcase breather from Pep Boys for 13 bucks. It fit snuggly into the rubber grommet on top of the valve cover. I installed it in the front hole as my pcv line runs to the carb from the rear hole...

I would really appreciate the groups opinion on this. It was my solution to the previous owner running the carb fuel bowl vent into the valve cover.

It seemed silly to vent gas fumes from the carb into the valve cover, only to pull them out of the other end and send them back to the carb...

Brand: Spectre Proformance
Part Number: 3995
Cost: $13
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