I just took the intake off my truck. The whole under side of the intake is covered in sludge oil...The center of the block,under the intake is nasty oily too...Is this the cause of a Plenum gasket gone badd?

 

Nope that's not from a bad plenum. Take that pan off the bottom of the intake, if it looks like that inside the intake then you know the plenum was bad.

 

what would cause this then...Truck never smoked before I tore it down..I 'm having to replace a bent rod..seen this and thought I better wait and get some advice before going on with it.

 

That's a nasty looking lifter gallery. Either someone didn't change the oil regularly, or they were running oil that contains parafin (eg Penzoil) which tends to cook and leave deposits like that when run for too long.

 

going long times with out oil changes

 

yep..your right Pennzoil....So you guys think just clean it up,change the plenum and put it back together..(plenum gasket or send off for the kit?..and Thanks for the quick responses and help

 

Drop the oil pan, and see if you can't clean some of that sludge out of there. Was that a bent connecting rod, or pushrod you were playin' with?

 

connecting rod...no sludge in the oil pan...but it was about year ago when i changed out the oil pump..

 

Honestly, i've seen a lot worse ones posted on here. That one doesn't look terrible. There was a thread on here not long back where someone claimed that is caused by using synthetic oil. I don't beleive that though. I have used nothing but synthetic in my truck, and when I took off my intake to do my plenum, I had no sludge of buildup.

 

ok,well im tearing on down....do i need the plenum kit,or just replace the gasket..will check back later..thanks guys