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Old 02-10-2005, 06:44 PM
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Oil in exhaust crossover???

Ok, I was pulling my intake off, and in the exhaust crossovers on the heads, they were filled with oil, didnt know why, so was the intake, I turned it over, and it dribbled out oild out of the exhaust crossover.

The intake gaskets show on the runners where oil has made it by apparently, but not really on the crossover. I cant think of what could cause this. Dont think it could be anything major, since when I was last driving the car when it was warm it was running fine. I've only went out to the garage periodically during the winter to warm it up and circulate the fluids. Even then it seemed to do alright, it just takes some flogging to get it to stay running untill it is warm enough to idle by itself. But im sure that was only because of the warn out dual point distributor, and old edelbog I had on it.

Any of you guys ever seen this. I sure hope this isnt a blown head gasket, but damn, it ran fine when it warmed up, so I dont think it would be, and if it was, it should be smoking like a john force burnout with the amount of oil that was in there.

Also, this thing never really used oil either.

OH yeah, if it helps, this is a small block chevy with Sportsman II heads.

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Old 02-10-2005, 07:05 PM
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Sportsman II heads come with the crossovers plugged. They are cast with the ability to be operational. I would guess no one ever drilled yours out.
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Old 02-10-2005, 07:08 PM
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No, I never drilled them out.

Ah ha, so your saying there might be a chance the leaky intake gaskets just caused the crossover holes to act like cups that hold the oil?

I hope this is right, lol, because I'm thinking of the worst here, lol.

Thanks for the quick reply man.
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Old 02-10-2005, 07:21 PM
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Skeeveman,

I have seen this often. I can not prove anything but I think it is the valve guides for the four center cylinders. They could be leaking oil down the stem of the valves and puddling in the cross-over. The reason it gets in the intake is because of the heat riser valve. It causes all the exhaust from the passengers side to "cross" over to the drivers side to exit the engine. Because you do not put any driving time on the engine the oil just stays there. It doesn't smoke because the oil doesn't get into the combustion chamber so it just rolls around in the intake.
Take a look at the valve guide seals on the center cylinders. They are the first to go bad because there are two exhaust valves side by side so the heat builds up and cooks the seals.

Have Fun
Scholman
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Old 02-10-2005, 08:00 PM
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The crossover doesn't go through into the head. It dead ends with Sportsman II heads unless you drill them out.
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