Oil in intake ports?

[Kevin D.]

Got my 416 going for 2nd time.1st time after 30 minutes crank got into windage tray.Tore completely down cut crank 10 under re honed cyls.Checked all put back together.Only thing changed was went with 928 comp springs to match cam.Inner spring slid right over seals.Starts fine but a lot of blow by out breahers that diminishes with warm up.Thought maybe rings needed time to seat.Drove 30 minutes yesterday noticed oil leak at front of intake pulled tonite to replace and find the intake runners with oil on them.All of them .Your input will be appreciated,Thanks Kevin. P.S. in take sits well on heads.

 

[RustyRatRod]

Are you running a PCV valve?

 

[Kevin D.]

No pcv valve.Breathers on valve covers only Kevin.

 

[67cudafb]

What kind of heads and intake are you using? Have the heads been milled and how much? What brand intake gasket are you using? If heads have had any serious milling then the intake face needs milled also. Take a straight edge and check both surfaces and make sure there flat.

 

[Kevin D.]

Fairly new edelbrock heads.Victor 340 intake.Fel pro 1213 gaskets.Checked intake fit good.Also checked with straight edge good.These heads were taken off my 340 with no problems,Kevin.

 

[rumblefish360]

Is the oil up high on the heads intake ports? That would be a gasket leaking. Old gasket or I'll fitting / mating surface.

O low in the port? Mostly in the bowl? Bad valve seals.

 

[67cudafb]

Are you running umbrella valve seals or Teflon seals?

 

[70aarcuda]

If you have the stock eddy seals...they suck....

change them out....within one year my new eddy heads were sucking oil into the intake port and down the valve...

 

[moper]

What rings were used? Have you tried a compression test yet? I'd expect them to not be fully seated yet depending on the wall finish, rings used, and assembly procedures - but there should not be oil contamination. With a previous good service record but oil in all the ports and pushing out gasketed areas it makes me think it's a ring problem. Unless this is a pure-track car you need a PCV system on it too. One side has the intake breather - the other has the PCV valve to the carb and no breather.

 

[Kevin D.]

Seems like the more I study it that it might be fuel in ports. Is this maybe the reversion I have heard mentioned on this site before.What causes it? Also do I need to fix it? Using the comp 540-520 solid cam with 248-252@50,Kevin.

 

[moper]

Fuel evaporates. Oil doesn't. So if there's oil up there, while it might be from reversion, the oil is the problem - not the fuel.
In terms of the cam - there should be little to no reversion. It's not big by any standards. But there could be sealing issues with the valve seats - which might be indicated by a compression test or even better a leakdown. Leakdown will also confirm condition of the rings. The valve seals might be marginal too - but they won't create crankcase pressure to blow out the end seals of the intake.

Sorry - reversion is the reflection of intake charge from the open intake valve. At low rpm there is little inertia to keep the mixture moving in the port so as the piston stops at TDC and begins to come up, but the valve is still open, some of the mixture can be squeezed back into the intake port above the valve. Bigger cams and valve jobs with great low lift flow are susceptable to reversion at low rpm because larger cams generally involve the intake valve being held open longer.