oil coming out of valve cover breathers - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-21-2007, 06:20 PM
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oil coming out of valve cover breathers

I have a problem with i think to much oil coming out of the valve cover breathers.i replaced them with new ones still leaks out.its a 454 chevy mid 70's block with 1970 ls6 heads with crane roller rockers.the guy i bought it from added one more hole on each cover so i have 4 breathers total. dont no why its leaking it drips on the headers.

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Old 05-21-2007, 07:02 PM
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Are there proper baffles in your valve covers? If there arent baffles some oil may be sloshing up that way. If there are and excessive oil is still coming up, I had the same problem. It was due to blowby from the piston rings. I am now in the middle of rebuilding my engine. Is your engine burning any oil? Is there oil pushing up into the pcv also?

Steve
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Old 05-21-2007, 07:13 PM
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there is no baffles and it does not blow smoke i'll look at pcv
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Old 05-21-2007, 07:18 PM
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You could try these. I had a problem with my PCV sucking up oil until I installed these.
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Old 05-21-2007, 09:47 PM
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Doc here,

You need Baffles in the valve covers, AND a Vented Oil filler cap..Oil will find it's way out unvented/unbafeled holes if the crankcase remains under constant pressure.

Check that the PCV you have is Correct for the engine you have..that may be a problem also.

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Old 04-08-2010, 07:58 AM
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I replaced the breathers with Moroso breathers with no PCV, and I installed the "baffled" grommets. I haven't had a chance to drive it yet because it's been raining the past couple of days. I should beable to get it out by the weekend.

Charlie
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Old 04-08-2010, 11:48 AM
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Gosh I miss DocVette-
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Old 04-08-2010, 03:11 PM
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I took it out and drove it for about 2 miles or so. It seemed OK. The cast aluminum GM valve covers dont have provisions for a baffle. I don't know why they don't. I'm hoping the "baffle" grommets will do the job over the long term.

Charlie
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Old 04-08-2010, 06:08 PM
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i know thread is old.but i guess it could help someone else out.
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Old 04-09-2010, 10:45 PM
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you need one pcv and one return

pcv in one cover and return in other cover

cross ventilation


return needs to be filtered somehow or another

if you look at a stock untouched engine you will see it is set up this way

and it is for a good reason

since 1968 they are all this way
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