
Thread: Help w/FE 390 slight smoking one exhaust pipe. Some black oil on 2 spark plug threads
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01-26-2017 06:54 AM #1
Help w/FE 390 slight smoking one exhaust pipe. Some black oil on 2 spark plug threads
Hello friends. You guys are such great help that I thought I would ask before performing any repairs. My 68 Fairlane 500 Fast back is smoking slightly out of the driver's side pipe. If you rev the engine it doesn't get worse but it does seem consistent at low rpms. I pulled all of the plugs cylinders 5 through 8 and all of them look exactly alike. No oil on the insulator or tip of any of them. Insulators are all uniform in color, just slightly off white. #5 and #8 spark plugs however do have some black oil on their threads though. My valve covers are not leaking. My brother agreed with me that the smoke coming out smells more like gas than oil but I do notice a slight drop in oil on my dip stick. This engine was recently rebuilt and had about $1000.00 worth of work done to the heads. Bored .060 over with solid lifters and racing cam. Ne Edelbrock Performer intake and ne Edelbrock carb. Othere than the slight smoking the car runs like a rocket and I do admit I enjoy this car to it's fullest, maybe a little too much. The rebuilt engine has maybe 500-700 miles on it. My question is that I'm thinking the intake manifold gasket might be trying to fail on the driver's side causing possibly the leaking and sucking of fuel and oil to go where it's not supposed to. I don't want to pull the intake unless this is the case and wondered if anyone knew if there was a way to tell before I perform this fun task. I also wanted to know if anyone though there was a better than felpro gasket set to use on this type motor with the aluminum intake. Any help would be greatly appreciated.
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