Need Intake help?

[Kwazrollinz28]

Okay Second rebuild and my Intake is still leaking in the back, I SWEAR TO GOD i used half a tube of the silcon and its still leaking, not as bad as before but still really annoying.

Is there anything i can actually do to forever stop this leak. theres a few pits in the intake underneath but i doubt that could cause it with as much silicon as i used, it holds up for about 2 weeks each time then blows out as usual. i know lt1s leak but cmon... i used thread sealer on the bolts, and i tightened them to all hell so thats not it.

It just litterally blows out after 2 weeks, then i have oil again on my block.


I scraped the block with a knife, then i brake cleanered it so it was clean, then i siliconed the hell out of it.

[98blackbeauty]

Do you have a breather on your valve cover. Maybe you have to much crankcase pressure. Passenger side rear valve cover opening is for breather.

[Kwazrollinz28]

Do you have a breather on your valve cover. Maybe you have to much crankcase pressure. Passenger side rear valve cover opening is for breather.

i have the stock valve covers, there's a Tube going from the Valve cover on the passenger side to the throttle body but thats about it.
You think new valve covers with breathers would help me?

[Fbomb]

I would try using Super Black RTV because it can withstand oil, make sure that your silicone doesn't get eaten away by the oil because that might be what's weakening it. Also just snug the intake on first, wait for the sealant to cure, then torque it down. If you torque it right away you're just squeezing all of the silicone out of the gap.

[Kwazrollinz28]

I would try using Super Black RTV because it can withstand oil, make sure that your silicone doesn't get eaten away by the oil because that might be what's weakening it. Also just snug the intake on first, wait for the sealant to cure, then torque it down. If you torque it right away you're just squeezing all of the silicone out of the gap.

i waited about 5-7mins cause i had to find all the bolts and where they went.
So next ill try the superblack, High temp stuff

i let the intake sit for 5 mins put 4 bolts in 2 in the front and 2 in the back that way i had it in place then waited a little bit. then i put the rest in and started tightening.

[98blackbeauty]

yeah could be wrong silicon, we got a tube of the high temp super black with the gasket kit. did brians twice knock on wood no leaks yet.

[Kwazrollinz28]

yeah could be wrong silicon, we got a tube of the high temp super black with the gasket kit. did brians twice knock on wood no leaks yet.

yep ill try that, my dad said i wouldn't need any of that high temp stuff, but this is getting annoying.

leaks annoy me more then anything. oh well ill get to paint my intake the right colors this time its always fun right lol

[DETROITMUSCLE]

i would wait a few hours before torquing the intake down next time.

[MunsterZ28]

i musta got lucky then, after my cam swap i just put a new gasket on and no issues

[meissen]

yeah could be wrong silicon, we got a tube of the high temp super black with the gasket kit. did brians twice knock on wood no leaks yet.

Haha well... keep in mind the first build only lasted one week. This time around it's been 2 weeks but it hasn't been driven every day.

[WMCCjames]

Is it blowing the RTV out of the gap or is it just a failure in one of the bonding interfaces?

If you are blowing the RTV out you have internal issues...if it's just a bond failure you have operator error issues.

[Fbomb]

I waited like 5 hrs. when I did my trans. pan gasket for the last time, last summer on the '86.

[WMCCjames]

I waited like 5 hrs. when I did my trans. pan gasket for the last time, last summer on the '86.

FYI...you never supposed to use RTV on a trans pan gasket. Little chunks eventually break off of the bead from the inside and get pumped through all those tiny ports in the valve body.

[sman]

^^^ Thanks for the info!

[98blackbeauty]

You do have 250 miles on it