82cetuner

iTrader: (9)

ok problem is officially solved I put the oil cap back on replacing the breather and then I added a breather to each valve covor on the 3/8 fitting.

just to be clear the breather DID solve the blowback issue with the dipstick and rear main seal, the problem was oil was misting or getting shot up into the breather, pooling in it and then leaking out. i put the oil cap back on and added a breather to both covors so now the oil would have to fight gravity to get out, and no no more issues not a single drop and engine running perfectly fine.

DietCoke

iTrader: (18)

Haters gonna hate. Glad it fixed your problem.

1lejohn

iTrader: (9)

My engine blows oil and the dipstick out sometimes when on the bottle. I have a valley PCV going into a catch can then into the intake behind the t-body. The pass side cover has a small breather and the drivers side is plugged. What do I need to do?

My can is really an air and water seperator. Its like an air comp. type. It catches maybe a tsp or less when I drive it.

82cetuner

iTrader: (9)

i would suggest try adding a breather to the driver side covor if that dont fix it then you may need to look into the piston rings, breathers should solve the problem if its just regular blowback and if your not running a stroked engine and having those kids of isues then it very well may be the rings

MIGHTYMOUSE

iTrader: (59)

i build custom pcv/catch can/breather valve set ups for some guys with the same 'problem' bigh hp/ FI / loose n/a if you wanna pm me.

you guys went in an impressive circle on this thread ill give you credit!

lstvr

This was my solution, two -10 breathers, i welded an alloy fitting in the rocker cover, i am going to put a -12 in the valley plate with a baffled catch can that recycles back into the sump also.
I am revving this to 7500rpm on the strip, on the rollers i can see it smokes a little after it hits 7k+, so hence i am going with a breather directly from the Crank case.
I dont rev it that hard on short circuit stuff, but only when i quarter it as i need to rev out in 3rd.

Jrp1978

iTrader: (10)

Forsome reason the last builder used a vally pan with no vent tube! SO in this case what do i do ?


I have breather on the oil cap
After market valve covers with a tube by oil cap and one in drivers side in the back !
I went and bought two small filters and some tees and a 3/8 nipple to drill a hole in driver side front and add nipple ! I was then gona run two filter between two line and leave system how it is
I have oil issues at high rpms where its pushing out rear seal and motor only have 23 miles on it !


So vent on oil cap then rear driver side hooked into catch can and then out of catch can to intake right before it goes into the intake there is a small pcv valve then goes into intake ! what i was gonna add was another nipple to front drivers side then take the unused nipple on passanger side and connect it to new front drivers side and put two small filter in that line !
God i know makes know since but would it help?

MIGHTYMOUSE

iTrader: (59)

jrp that sounds remotely right but i got lost about 2/3 thru it.
you can do all that but as long as you have an open element on the oil fill, while you wont push your rear seal, you will also not have any real pcv.
are you in va by chance? i see you know steve.

Wildcobra

Alot of good info

Doug G

Fresh build (under 200 miles, LQ4 w/ LS3 heads, and cam'd) here and same issue with oil out dipstick tube. 3/4"nipple with breather on the cap for a fix ?....we'll see soon.

MIGHTYMOUSE

iTrader: (59)

adding a breather will always let pressure out the engine, however it will also always defeat the pcv system (unless that is you have a one way breather like i use on what i make.)