Heartbreak

I have a 1982 C3 crossfire.

Put a new intake manifold gasket on the crossfire.  Lit the engine off and it still ran a little fast about 10K that was down from 12K.  Used some carburetor cleaner to check for leaks.

Heard a puff sound when I sprayed the manifold around the distributor and next thing I know I can see part of my new intake manifold gasket.  I know that is not good.  As luck will have it a person I met on the registry lives a couple of miles from me and is putting a different engine in his vet.  He will give me the gasket.  So I can try this all over again tomorrow.  

I would like to have any suggestions on what I should or should not do.  I would really like the torque sequence for the intake crossfire intake manifold. I started on one an when clockwise.  Was that wrong?

Torque to 25# over three revolutions around the manifold bolts. 

Did you use the rubber end gaskets on the block? If so, remove them, and instead, use a 3/8" bead of silicon sealant there. The rubber gaskets will not let the manifold set all the way down on the heads properly, and that can cause all sorts of problems.

Other than that, you can use a small amount of yellow(or black) weatherstrip adhesive around the water jackets to help hold the gasket(s) in place on the heads.
I'll look to see if I have the sequence for a cross-fire, but it should be no different than any other small-block...


                                        Adams' Apple2007-12-29 19:23:56

Are you talking about the top plate sitting on top of the manifold, or the manifold that bolts to the heads? The Crossfire intake is 2 pieces.

I dont know if this helps, the torque specs seem a bit vague to me.  Joel, do the torque specs look right to you on this diagarm.  This seems to be for the top plate.  I cant find anything in the shop manual that shows torque on the bottom plate that bolts to the block. 

That is showing the specs for tightening the upper "plate" to the lower manifold, and the specs, 20-34ft lbs are correct for those fasteners. The specs for the lower manifold bolts are 30ft lbs.

Yep, just found it in the specs section in the back of the chapter

I'm talking about the upper plate.  The lower manifold that bolts to the heads is ok.  It is just the top plate.  I will pull it off tomorrow and confirm that I did not miss a bolt.  I do not believe there is anyway I could have.  But!!!. 

I just could not find any torque sequence for the bolts except what one person said on the net and that was to start on one side and go clockwise around. 

If that is correct I know the new spot that I will be starting at.  I will also check the plate for flatness a little closer this time.  The good news in all of this is I found a person in San Diego that has a spare top plate he will give me if I need it.  He gave me a new gasket so at least I'm only out the time not time and money.

Please give me some wisdom on the torque sequence

Gilbert

It is the top plate.  I figured that I would just look someplace on the net and pick one up.  That was not the case. 

The other 82 C3 owner in San Diego that was checking out the Registry  offered me a gasket kit he did not need and when he found out I had a warped  plate dug his out.  He put a X-jet on his vett and did not need it anymore.  

I just ran a flat edge over it and it looks good.  For sure better than the last one. 

He gave it to me but I would like to pay him something for it.  Any suggestion?

Offer him a Gold Membership to C3VR!!!