Short version: it's coming from up top somewhere and only occurs with sustained 2500+ RPMS.

Long version: Swapped the intake and the valve covers. I checked it quick and it is running down the back of the block bear the bellhousing and dripping down the filter onto the collector. I haven't investigated too far yet but I changed both the valve covers and intake around the same time. I'm leaning more toward a rear support rail (china wall) leak simply because it doesn't drip anything after a leisurely drive or just warming up in the driveway or idling. I suspect the rear rail also because the machining on the intake is questionable... I only smell it when I get on it hard and or sustain RPMS above 2500 for more then a few seconds. With the amount of oil flying around under the valve covers at all times I would think it would always drip a little and I'd always smell it.

I hate leaks. I have dye and a UV light so I am going to start there after degreasing the rear of the block but the thing is just a pain back there. If anyone can think of anything else that is that intermittent or fits when it occurs and in that area I am all ears. It only started this the last month or so but it is slowly getting worse. I'll hopefully tear into it later or this weekend but anything else of interest is greatly appreciated. Also, it is only on the driver side.

-Paul

 

Have you checked the oil pressure sending unit? Mine was leaking there.

 

Can you smoke test thru the oil fill cap. That may pinpoint the leak.

 

Check the oil pressure sending unit and the oil switch. Both on the rear near the firewall.

 

I haven't forgotten this. It was in fact the rear intake support rail. I'm going to start tearing it down this week to make the repair. Will report back upon finishing.

I was able to observe the leak in neutral holding it to about 3000 RPMS for a couple seconds. At first I thought it was the oil pressure sending unit adapter but it was just rushing out from under the intake rail. I would have suspected the oil pressure sender however, being it is fairly new I omitted it for now. I will inspect when its apart (easier) to check.

 

Curious what you did to correct this. While replacing intake gaskets, I was able to see how loose that whole ridiculous sending unit “tree” of switches had become, and that tightening down was going to point the assembly toward the intake, so it had to remain backed off.
I was hoping to use a low profile nut to lock it down on the block, but realized it was a tapered pipe thread, so it was either stack it with washers to cinch up the threads at the desired orientation, or tap the hole further. I opted for washers and lock washers, and tons of high temp sealant. Same issue with the extension, was turning past its snug-point. More washers and sealant.

Both are now super-locked down, but can be removed if necessary. Of course, the china wall got its share of Right Stuff in that area, since that’s where the sealant looked the most deteriorated.

 

I just replaced both sensors.