chevy 350 vortec problem

[markg]

i recently had to leave my 86 monte at a garage for insp.they were gonna play with the carb for emmisions.they got it thru and my wife has been driving it since.this was about 3 weeks ago.i took it out the other day and punched it once to merge on the hyway.i saw lotsa blue smoke behind me and now im really confused.it only seems to smoke when i get on it.this is a 350 crate engine .the 350 deluxe vortec with a build date of 2001.i bought it brand new and never really beat on it and kept well up on all of the maintainence.i pulled the plugs from the smoking side and found all of the plugs to be in great cond except for the one forward of the last.(i believe this to be #6)this one was just about completely oil fouled.i changed the plugs just 2 mos ago and all was fine.the ones i took out were all normal.i cleaned this plug up and swapped it with another.i bought a new pcv(this plug is directly below it)and went for a spin.it still smoked from the pass side on heavy acceleration.then i pulled the pcv out completely and tried it again and it still smoked.i did a compression test on the pass side and they were all 165 but when i pulled the #6 plug it was close to being oil fouled again after just 2 days.the car runs fine off idle but is idling terrible since this started.at idle im getting between 13 and 15 on a vac gage at around 750 rpm.everyone is telling me that is a bad valve seal and i was agreeing untill salle chevy told me that it is probobly the intake gasket.i special ordered a improved design fel pro one today for 25 bux.has anyone ever had a problem like this?
any help is greatly appreciated.

 

[GrimmJeeper]

this should be here:
http://www.naxja.org/forum/forumdisplay.php?s=&forumid=48

and watch out, you're going to get flamed for your sentence structure.

 

[Nuke Proof]

From what I can understand, it sounds like the oil control rings on number 6 (passenger side second from the back) is bad. Usually valve seals only smoke on start up and it is usually a very small amount of smoke. If the intake gasket was bad enough to allow enough oil to wash into the intake tract from the galley to foul the plug, you are talking about a huge vacuum leak as well. I am not saying it's not possible, just unlikely.

Edit: I take that back I was able to read it with one eyed closed

 

[markg]

it is idling horrible and the vac at idle is only 13 to 15.this could indicate the intake gasket scorrect?

 

[Nuke Proof]

Yeah now that you mention it, that is indicative of a vac leak. Provided you don't have about a 236* @.050" with a 108* lobe seperation camshaft.

But with a leak of that size, you should be running a little hot and have some lean cylinders. Usually 5 and 7 are leaner cylinders, check those plugs first and see if they have any purple speckling on them. That will show an extremely lean condition. Another extremly lean symptom is exhaust that burns your eyes when you walk around the back and the "lean stumble."

Hope this helps.

 

[markg]

its a 330 hp 350 vortec "deluxe"crate motor from gm.i bought it new and its prolly got 60,000 on it now.

i found out something else today.the intake is only torqued to 11 ft lbs.everytime i do somthing major under the hood i have been cranking these in a little bit more thinking they seemed a little loose.maybe i damaged it by tightening too much.
ill letcha know how it goes!

 

[Nuke Proof]

Now that my light switch just came on and I realized you said vortec about three times, it clicked. The Vortec head and intake combo is very tempermental to torque sequence and to the lack of silicone on the water passages. This is because the bolts pull the intake down vertically into the galley and no diagonally toward the head. Sorry it took me so long. Been a little slow since the semester started back up.