Ok - I have the motor out of my 96 Silhouette van. I'm installing a
remanufactured long block. What's the proper proceedure for installing
the valley / intake manifold. Is there a sealer that I should be
Intake gasket failure was the cause of my engine failure and I want to
be dang sure this intake gasket is sealed without damaging the gasket.
It's pretty straight forward. Make sure all surfaces are spotless and
dry (use brakecleen and clean rags), have a good quality RTV ready,
the black RTV that GM sells in a caulking gun style tube works very
well, get yourself some "blue" (medium strength) loctite, and make
sure that you have the updated gasket. I doubt that you can get it
anywhere else but at a dealership. It will be completely black,
including the rubber seals imbedded in the plastic gasket, and will
have two metal pellets imbedded in the gasket at either end of the
Install the two side gaskets to the cylinder heads. Now install
your pushrods (two different lengths, short ones on the intake
valves, long ones on the exhaust valves) and torque down your
rocker arms. Get your intake manifold prepped, clean and dry.
Lay down a nice fat bead of RTV on the two block surfaces
(front and rear) and make sure that you get some RTV right
in the corner, even slightly under the gaskets will help, and
extend the bead up the gasket just a hair, maybe 1/8-1/4 of
an inch. Put your manifold in place, make sure your intake
bolts are clean and dry, install the loctite on the threads,
torque all the bolts in sequence to 11 ft lbs, and then torque
the 4 end bolts to 18 ft lbs. (this is for the updated gasket)
That should be it. If I missed something, someone else
Sounds right to me. That's pretty much how I did mine. Except I used
Naptha instead of brake cleaner to clean the gasket mounting surfaces.
I also recommend the GM black RTV. I couldn't find anything comparable
at the local parts shops. It's overpriced at the dealer. I think I
paid around $16 for a 3 oz. tube. The part # is 12345739
Yes...probably to you and I, but not to the un-initiated.
Maybe, but for all I know, they are the suppliers
of the OEM gasket. As I mentioned, there is
an updated gasket available, but I doubt that
you will find it anywhere but at the dealers at
I'll be getting a gasket with the Marshall Long Block I've
ordered...but...mayhaps I should get an updated GM gasket eh?
I really (really) don't want to have to do this job again!
Who thanks all for the help!
I would check with FelPro for their latest intake set. Check with them
directly, do not rely on your local supplier, there is a slight chance he
may be trying to move an earlier version he already has on the shelf.
While it very well may be that GM is using FelPro for this application, it
is also possible they are getting them from Imperial Chinese Gasket Factory
in order to save a nickel. You gotta admit GM's past history on this
particular gasket set is not reassuring. About as good as Neon head
gaskets, several revisions on that one also.
Just an opinion.
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