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Discussion Starter · #1 ·
i just got done with my built motor about two hundered miles ago. the first fifty miles or so i didn't have pvc valves in the valve covers and i noticed that there would be like a oilly smog coming out from both of them, (factory vortec covers) so i went and got two of the correct pvc valves for the year motor (98 vortec 350) and plugged those in and some cheap APC breather filters from the ricer section. worked fine, i thought. i'm driving the car down to the range and i see a white cloud behind me so i shut it down and checked under the hood, oil spurting onto the header from the dipstick tube, given the stick doesn't fit right to make a great seal, i dont think it should be coming up like that. i checked compression hot and it was 165 +-3psi across the board so i dont think its rings, i'm guessing the filters got saturated with oil and built up the pressure. but how should i correct this problem?

motor is a 10.5-1 vortec 350, hr282xr comp cam, air gap, holley 650 dp. 15* initial, 13* vac, 21* mech.

(ps i would like to thank you all for helping me build a car that scares the **** out of me.) '84rx7, 420ish hp, 460ish trq t-5.
 

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Discussion Starter · #2 ·
i'd also add, there is a small amount of pressure coming from the pvc ports at idle, it'll lift a sheet of paper, and more at higher engine speeds, i was down almost a quart after my first 50mile oil change, remembering that some of which is now coating the engine. plugs all look perfect too.
 

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I am having the same issue on my 305 but have not put my pcv in it yet. be interesting to see what we come up with.you have two pcv's? I was told to do one on one side and a strait breather on the other. havent done it yet but will try it. :confused:
 

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slate84 said:
well, there was a rubber port that fit it on each one. one valve cover with a pvc size rubber bung, other with oil cap and pvc rubber bung.
aww well what I do is just run a breather as my fill cap. so it will get good ventilation. when I first put the motor together I ran a fill cap and when I drove down the street it would blow the cap right off with all the pressure. try that and see if it helps. :D
 

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The PCV valve draws air through the crankcase like it's name. If you run a pcv and breather on each valve cover the air for the pcv will come from that valve cover not through the crankcase. If you have two holes on each cover put pcv in one other hole plug or put in filler cap and on other valve cover put one or two breathers. Pressure builds up in the crankcase, more rpm more pressure. It needs to be vented or will vent and spill oil out the easiest place.
 

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Henry the 32nd said:
The PCV valve draws air through the crankcase like it's name. If you run a pcv and breather on each valve cover the air for the pcv will come from that valve cover not through the crankcase. If you have two holes on each cover put pcv in one other hole plug or put in filler cap and on other valve cover put one or two breathers. Pressure builds up in the crankcase, more rpm more pressure. It needs to be vented or will vent and spill oil out the easiest place.
ya I have 1 hole each cover so I run breather 1 and pcv other. no fill cap. ;)
 
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