jwilsonf

what would cause oil to come out of exhaust? compression good no oil fouled plugs, good pcv valve,

ddnspider

iTrader: (26)

valve stem seals

Jon@Texas-Speed

iTrader: (18)

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

ae13291

iTrader: (8)

do you mean using locktight on the rocker bolts or you meanto use RTV sealent?

Sales2@Texas-speed

iTrader: (5)

You use sealant on the rocker bolts to seal the threads and keep oil from getting by.

eseibel67

iTrader: (10)

The intake rocker bolts lead to the intake ports? Didn't know that.

I better go back and seal them suckers up.

ae13291

iTrader: (8)

wow i had no idea. so i use the locktight on the exhaust rockers and use rtv sealent on the intake ones? do we use the red, black or blue rtv?

Sales2@Texas-speed

iTrader: (5)

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.

jwilsonf

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?

ae13291

iTrader: (8)

get a pcv catch can

ae13291

iTrader: (8)

thank you Matt, i will make sure to use sealent when im putting mine back together.

WhiteRhino

iTrader: (6)

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.

BlownChevySS

iTrader: (1)

When I pulled mine from factory, most of the rocker bolts were drenched. I had oil in the intake ports and tb really bad. What is a good amount to use when I put it back together?

Sales2@Texas-speed

iTrader: (5)

Permatex RTV silicone will work perfectly.

jwilsonf

question?? can they leak on stock heads or is it only on the ported? i havent had mine apart and didn know if the bolts would come down through stock of just ported..

ae13291

iTrader: (8)

^^^ yea i wasent sure bout that one either

Parasoth

iTrader: (1)

Found oil on mine when I pulled them from a completely stock block, same as BlownChevy apparently.. Interested in this as well.

WhiteRhino

iTrader: (6)

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.

Parasoth

iTrader: (1)

Makes complete sense now.

Thanks WhiteRhino.

ae13291

iTrader: (8)

ok so i wouldent need the sealer on my stock untouched heads then?