Thread: oil blowing out at high speeds

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Coming down a long grade on compression, does it smoke when you roll the throttle on far enough to maintain highway speed?
If so valve guides are probably worn.

If you roll the throttle on from low speed does it smoke and blow oil?
Rings are probably not sealing as well as they should.


If things look ok and you're on the highway, running 3000-3500 rpm (short gears) for a while, nail it and then smoke comes pouring out you have an oil vapor control problem.

You may even see a faint blue haze following the car while running at above normal rpm.


Aside from the above, this looks like it could be the problem: "I'm running a hose from my oil vent in my valve cover to my carb to take care of some blow by."

By oil 'vent' you mean PCV valve?

Or you're running a line from rocker cover oil filler cap to the PCV inlet bib on the carb thereby putting vacuum directly on the crankcase?

Or you're running a line from rocker cover oil filler cap to the air filter . . . and if so, does the line terminate inside the filtered area or inside the air filter, but not in the filtered area?

Take a look at this:

The line I'm running is not my pvc valve hookup , its on my other side on the engine and I'm using my vacuum from the carb to suck in blowbye which I never had until I put in the new cam. That took casre of blowby, and my valve guides are in good shape and the rings have seated OK as I'm not blowing any smoke out exhaust at any speeds. Take a look at the picture.

Which didn't come through. Let me try again.

Here's another picture

This one is from my PCV valve