Intake manifold leak

[bigmuddy]

I started using this stuff when it came out, no it's not as cheap as the old stuff but I have used it in a number of applications without fail.
https://www.permatex.com/our-brands/the-right-stuff/

 

[RODRIG3911]

Just a quick recap in case someone runs into this in the future.. It WAS leaking from the intake manifold and after replacing the gaskets and driving it hard a couple hundred miles, all is well. No more leak! I think it's important to use a large bead of RTV front and back, use studs for guides to drop it right the first time, torque it in the correct sequence, and wait 24 hours before adding fluids back in. Once again thanks for the tips guys. Glad to be back on (and off lol) road again

 

[Jfryjfry]

Glad to hear you got it remedied - leaks suck!

 

[Kevinehill]

What did you figure out on this? I changed my intake so I could put on a FiTech and found there was oil leaking at the back of the intake manifold. I redid it and tried to fix it, but then it leaked at the front. Third time I tried again, cleaned the surfaces (I thought very well) and no oil leak in the front, but again at the back. I am wondering if I somehow clogged a drain from under the intake manifold. I have replaced both PVC. This is on a 1970 with the original 302. Thanks!
Kevin Hill

 

[phred]

I’ve had 302 that didn’t leak there and some that did. Usually no more than a teaspoon over 5000 miles. It looks messy but really isn’t a problem. If I know it’s a leaker I treat it like a radial. Add oil if it’s not leaking because it needs a quart.
Show car leakers are annoying. Leaking drivers are just that. A driver.


Sent from my iPhone using Tapatalk

 

[RODRIG3911]

Kevinhill its been 6 months since I did this, and still no leaks.. Don’t use gaskets on the front or rear or the intake, just a nice bead of good rtv and use studs to guide the intake in place. Wait 24 hours for it to cure before adding fluids. Good luck man

 

[73azbronco]

Sage advice, if its not leaking, its not working.

 

[blubuckaroo]

The reason those front and rear seals aren't reliable, is the heads may have been milled a bit. that changes the whole geometry of that gap.

I do believe that if RTV would have been available at the time these were built, those little gasket pieces wouldn't be in the gasket sets at all.

 

[nvrstuk]

There were a few "different methods" on this thread about how to use RTV. I called Permatex back in the early

'70's when I started using it instead of Indian Head Shellac and this is how I"ve been doing it ever since.

Use these instructions as per Permatex- it will seal and not leak...

Glad you are up and running.

file:///C:/Users/Brian/Downloads/82180.pdf