oil leak

[bd]

Try to find Permatex Ultra Grey or Ultra Copper.

[Tx Firefighter]

I'm assuming since your truck is an 87 model that you have centerbolt valve covers then ? If so, the gaskets are rubber and require absolutely no sealant. Install them dry and torque the four bolts. They won't leak.

On the intake manifold, replace gaskets and use a 1/4 inch bead of black silicone in place of the front and rear rubber seals that come in most gasket kits. Felrpo kits come with a small tube of silicone and instructions to do it this way.

That is the way GM trained me when I worked in a dealership.  They had so many warranty claims on leaking manifolds that they released a service bulliten on the matter explicitly explaining to do it this way and never use the rubber end gaskets.

[Als87]

It is an '87 but it's not the original motor. Well at least the intake ain't cuz an '87 should b a throttle body but I have a 4barrel (q-jet)
The guy I bought it from had started to put some wrk into it but ran out of $ & lost his license so had to sell the truck to pay fines. So I got a super deal on the truck. Solid body, no rust but I could tell he ran out of money cuz there's a couple upgrades on the rebuilt motor but some other stuff was either done cheap or rushed so I'm tryin to find where he left off lol.
I did find the orange rtv sealer & hope I have a few hrs this wk to replace that.
I will replace the gasket but toss the rubber seals & put a nice bead around the intake.

[Irish_Alley]

i dont see why not but i cant say it will work never used it before on the manifold

[afran]

I had the same issue until this weekend.  Spent the majority of Saturday pulling off the intake and replacing.  The guy that just installed my engine put the smallest amount of clear silicon and it was leaking at the corner where the intake,block and head meet.  I put on a good bead of high temp RTV and new gaskets.  No more oil leak.  Pain in the butt for my old out of shape self, but saved $$$.  Hope you got yours fixed.

[Irish_Alley]

clear silicone? didnt think it was made to handle contact with oil and heat lol

[afran]

appearantly not.  Hence the oil leak!  Still debating on kicking that guys