looks fine to me... the pvc will draw in some oil out of the motor and that's what you see there.

 

here's a pic of mine when I pulled it off... the leak was at the end of the plenum near the distributor...

[IMG]local://upfiles/1508/FA71BB962C3A4B4A8817EA982A17BD87.jpg[/IMG]

 

That looks nasty! Although I am running a M1 manifold [no plenum cover set up-thank goodness], after about 5 or 6 years there is no oil or oil film in it even with the crankcase breather and pvc hooked to it that I could see this last summer when I changed out the cylinder heads.[I'm sure there is probably some oil film from pvc as steveoo suggested but it was not noticable]. I recently purchased a kegger manifold to port [ just to play with] and it looked like yours does inside,when I pulled the plenum cover I could see where the gasket had become oil saturated and hardened,then seperated from the sealing surface of the pan and was letting oil pass thru in 2 spots,nothing you would probably notice performance or vacuum wise YET ,but it was definately on its way out.

 

why would you even mess with the kegger if you have the M1 & a supercharger? id think it would be a huge step back.

I have a modded kegger in the garage that would be better suited for a dakota or 2x4 ram... pulls really strong from 2600 rpms...

 

My brother wants to try something different on his truck but doesn't want to fork out the buck's for a M1, so I am cutting the runners off [just angling them more] a bit for him to give it a try, thought I would do a spare one and give it to him for xmas all painted up and such,it may turn out not to be much better for the work involved, but... I had to purchase one off ebay as I threw my original one away a long time ago.That way if it's it screwed up he won't kill me for messing up his only manifold. [sm=innoc.gif] No,I won't replace my M1, I had contemplated it at one time but no. [sm=gears.gif]

 

what is his truck setup? QC 2x4, 4x4 etc...

I did 1.5" off the runners and polished the area's I could get at and it helped out alot on the top end but the bottom end suffered a little too much for my truck. Im' thinking of doing another intake (I have a stock one on there now) and starting with .5" off the runners.

the 1.5" moved the power up above 2600 rpm's which didnt workout for my truck. so I figure .75" should be around 1800 and the .5 around 1400~1500. this is where the rpm's usually start out anyway. are you going to open up the injector bores?
let me know how the mod goes...

also I have pics of mine if you need them.

 

His is a 1994 4x4 Sport with the 5.9.He has headers and a Gibson exhaust with 4.10's and 33's. If he has done anything else to it since then I am not aware ,of it other than an MSD ignition system. I removed about 1/2 inch , maybe a little bit over 1/2 after cleaning them all up,starting at the innermost part of the manifold runners and angled them up to the stock starting point of the runners on the outermost part of the manifold.I hope that makes some sense as it is difficult to describe, wish I would have took some pics but I have it all sealed up now and ready for masking and paint. I chamfered the inner portion of the manifold runners and chamfered the injector ports out at the "spray" end,some of them were off by quite a bit it looked like, [where the milled wall was in relation to the injector port location], I just hope I did not remove to much of the runner, but if you are thinking of starting at .5 or .75 that gives me some hope as it sounds like you have had some experience with this .Oh, I also opened up the TB bores enough to remove the ridge in them.I have read that you can take some of that epoxy that is like clay and fill the gap below the runners,let it set up and harden and that brings back quite a bit of bottom end by reducing manifold volume ,makes some sense tho as the M1 has extremely short runners and about a 1/6 of the volume of the kegger , which I suspect is to raise the vacuum at low throttle but I don't know for sure,but anyway,I did not mess with that.

Bad day for dial-up connection,this is taking forever and numerous re-connects-sorry-[:@]

 

cool, when do you think you'll be doing the install? Maybe you can give me some feedback as to how it performs compared to the stock config of the intake.

when I was evaluating mine... what I did since i didnt have a dyno was I got it in drive and at a low enough speed on the hiway so there was plenty of room in front of me, then accelerated at 1/2 throttle paying close attention not to move it. when the rpm's passed 2600, you could feel yourself being pressed more into the seat (butt dyno) which told me that's where it started breathing more and was building more power. that's why I think .5" would be a good place to start. since you already did it, feedback would be great! the manifold I have would be awesome in a 2x4 or 4x4 single cab truck. mine is just too heavy for it.