oil in exhaust?
Even with a good PCV valve, you could still be vacuuming oil into the intake. I would take off the induction and look in the TB and see if there is any oil sitting in the bottom of the intake. Like mention above, valve seals are something else to look at. If they are worn, oil can run down the valves and into the combustion chambers. You could also check the intake rocker arm bolts. If the rockers have been off the car and you didn't use any kind of sealant on the bolts, oil can run into the intake runner there. Typically any small amount of oil is burned during combustion so if you can actually see it in the exhaust pipes, it should be pretty easy to diagnose I would think. Let us know if we can help!
Jon
Jon
Even with a good PCV valve, you could still be vacuuming oil into the intake. I would take off the induction and look in the TB and see if there is any oil sitting in the bottom of the intake. Like mention above, valve seals are something else to look at. If they are worn, oil can run down the valves and into the combustion chambers. You could also check the intake rocker arm bolts. If the rockers have been off the car and you didn't use any kind of sealant on the bolts, oil can run into the intake runner there. Typically any small amount of oil is burned during combustion so if you can actually see it in the exhaust pipes, it should be pretty easy to diagnose I would think. Let us know if we can help!
Jon
Jon
You use sealant on the rocker bolts to seal the threads and keep oil from getting by. 
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GM only puts a little goop on the washer part of the bolt, I assume to hold it in place a bit. Only once ported do the heads need the sealant on the bolts. Our technician uses black RTV on the rocker arm bolts (permatex I believe), due to it being somewhere between teflon and loctite in hardness.
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Thread Starter
Teching In
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I have had the rockers off when I installed the trex, put lil dab of red loctite on the threads when torqued down rockers, but am fixing to change pushrods, so i will defineitely put some rtv on them... I looked at the valve stems to see if it had any of them kicked up but all looked fine, from what i could see..only other thig that may be connected to the oil issue is low vacuum, it was pulling about 12-14, didn know if that was common with trex or what should it pull? Is did notice a lil oil behind the throttle body, what could i do to to eliminate that?
I have had the rockers off when I installed the trex, put lil dab of red loctite on the threads when torqued down rockers, but am fixing to change pushrods, so i will defineitely put some rtv on them... I looked at the valve stems to see if it had any of them kicked up but all looked fine, from what i could see..only other thig that may be connected to the oil issue is low vacuum, it was pulling about 12-14, didn know if that was common with trex or what should it pull? Is did notice a lil oil behind the throttle body, what could i do to to eliminate that?
GM only puts a little goop on the washer part of the bolt, I assume to hold it in place a bit. Only once ported do the heads need the sealant on the bolts. Our technician uses black RTV on the rocker arm bolts (permatex I believe), due to it being somewhere between teflon and loctite in hardness.
I've always used the Black Permatex rtv to seal up the bolts as well. It has never givin me any issues. It can be a pain to clean out if you have to remove the bolts though. I use screw in studs, so it's never been an issue.
Even with a good PCV valve, you could still be vacuuming oil into the intake. I would take off the induction and look in the TB and see if there is any oil sitting in the bottom of the intake. Like mention above, valve seals are something else to look at. If they are worn, oil can run down the valves and into the combustion chambers. You could also check the intake rocker arm bolts. If the rockers have been off the car and you didn't use any kind of sealant on the bolts, oil can run into the intake runner there. Typically any small amount of oil is burned during combustion so if you can actually see it in the exhaust pipes, it should be pretty easy to diagnose I would think. Let us know if we can help!
Jon
Jon
Permatex RTV silicone will work perfectly.
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They're blind holes on stock heads. So oil shouldn't get past them. Most, if not all ported heads cut into the rocker bolt hole. So if not sealed, oil will get past the bolt.
I can see oil on the thread of a stock headed rocker bolt. But it can't leak into the intake runner unless the head is cracked.
I can see oil on the thread of a stock headed rocker bolt. But it can't leak into the intake runner unless the head is cracked.
