Is this a rear main seal leak? (pic)

[timmycharger]

I had a small leak coming off of the bottom of the bellhousing since putting in the motor last year. It was a small leak before, but it seems to be getting worse.  Interestingly, it seems to have gotten worse since I added a quart of Marvel Mystery oil about 2 weeks ago thinking it would quiet down my lifter noise.   I ended up swapping out all of the lifters which did take care of the ticking I had.

The Marvel Oil was like water, could that cause the leak to worsen? I felt I could live with the 3 inch wet spot it was leaving before, but now its leaving 8 inch puddles after shutting it down.

I need to change the oil now as I used assembly lube on the new lifters but I am thinking of pulling the pan off to take a look.  I tried snugging down the rear pan bolts yesterday but they are all tight. I am running a windage tray sandwiched between 2 gaskets. I used spray tack on the gaskets as I always did.

For those who had a rear main seal leak, does this look like one? I am running a Lakewood bellhousing with motor plate. Is it even possible to access the main seal with this bellhousing? it looks crazy tight in there.

[303 Mopar]

It could be the rear main, plugs on the back of the engine, back of the intake, rear part of the valve covers, etc.  I would start up top in the rear of the engine and look for any oil leaks.  You can also buy a dye kit and use a black light to see the origin of the leak.  I would pull the trans/bell housing and look at the back of the engine for any loose plugs too.  I chased a leak on a 408 stroker for months.

[RECHRGD]

Also, check the oil pressure sending unit...

[timmycharger]

Thanks guys, unfortunately, its not coming from up top, sending unit, valve covers, or the intake. I had the intake off last week doing the lifters and it is all bone dry back there.  I hope its not a plug but that certainly would be a possibility.   The thought of pulling off that bellhousing is giving me the sweats as that thing is a beast to work with.    I was just curious if anyone recognized the pattern in which the oil was dripping down, appreciate the feedback.