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Topic: 1986 Lower Intake Manifold Questions

in Forum: C4 Engines

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1986 Lower Intake Manifold Questions (1/2)
 8/4/21 9:14am
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Washington, IL - USA

1986 Coupe. This is from the 1989 VH1 sweepstakes. I won this car in a sweepstakes from thelostcorvettes.com this September. It only has 40,000 miles on it and I am going to spend the winter doing minor things to it. It runs and looks great.

Joined: 12/26/2020
Posts: 11

I am needing to know what RTV sealant and threadlocker to use on the lower intake of the 86. I have the plenum and runners and the fuel rail off of the car and I have noticed that all of the lower intake manifold bolts are not tight at all. Rather than just retighten all bolts I want to remove the manifold and install new gaskets. I have worked on cars before and am confident in my ability to do this job but I have several questions.

The thing that scares me the most about the job is the initial fear of removing the distributor. What is the best way of removing it knowing that I can get it back to exactly where it was? 

I plan on using a little contact cement to hold the gasket to heads.

What is the best RTV sealant to use on the ends of the block? I was thinking Permatex 85o8o Ultra black.

What threadlocker should i use...Permatex orange or blue:?


I would appreciate any help and tips I can get and thanks in advance for the help.

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Re: 1986 Lower Intake Manifold Questions (2/2)
 8/10/21 10:56pm
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Lake Grove, NY - USA

1985 coup , Black ,Auto, 85000 miles , wanted an 85 for its the year i graduated high school , needs work sat for a while but its what i wanted , love restoration , did the restoration work on my fathers 1971 Vett

Joined: 6/8/2020
Posts: 6

Hi Kenneth , i have an 85 and had the whole top end off mine , its not as bad as you think , the trick i used with the Dist. is just take a bunch of pictures with your phone with the cap on then take it off and not where the rotor is facing again take all the picts you need , just make sure you dont rotate the motor and it will be a breeze to get it back to the exact spot just refer to your picts , i use this method for almost everything , i had the rear out of mine replaced all the fuel lines the tank so it was a while before i re assembled it the picts were invaluable : ) , the silicone you suggested is perfect , i would advise against thread lock , if you ever have to get them back out its a a pain in the ass , just make sure you torque everything to spec and you wont have an issue :  0 good luck and reach out if you have any other ?s

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