| Is it oil, or is it a gas slick??June 26 2008 at 9:42 AM | Tom Slayton (no login) |
Response to Oil/gas ? slick from port exhaust, 454 Merc. |
| If your motor is not smoking with a bluish oil smoke, your slick you see on the water is probably the result of a rich carb.
On the Ford big blocks, as Paul so carefully documented a while ago, the block itself can develope a crack and oil (which is under pressure) can get into the water cooling system. On an antifreeze cooled closed cooling system, this would show up as a oil creme in the surge tank, but on an open cooling system you would most certainly see an oil slick as one little drop at a time eventually got into the exhaust system.
I suppose this same thing could happen with a faulty head gasket.
The first thing I would check would be to see if your motor is running rich. Can you smell unburned fuel? If so, then some is also getting onto the water.
You didn't suggest this, but a faulty lifter would have nothing to do with an oil slick. I don't know if you can fish out a lifter on a GM big block or not, without pulling the head, but you sure can on a Ford 427 so it may be possible. They may even have a specialty tool for this at your local parts supply store. I left you a suggestion on another post, about using Marvel Mystery Oil on that lifter, since the only problem might be the fact that it is gummed up a bit. You might even pour some directly down the pushrod hole when you isolate which one it is.
Good luck,
Tom
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