Leaking valve covers.

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So I've been dealing with problem for awhile now. The 5.8L EfI was rebuilt. But the valve covers are leaking down the back of the block. I bought some new edelbrock valve because the old one had a warp. Got new blue rubber gaskets. They leaked the worst. So I went to my engine builder and he gave me thick black rubber ones. Work until the oil got hot. It's the spot under the upper intake. If you looking at the front it's the left rear side. All the way in the back. Any ideas on how to stop the leaking.

 

miesk5

96 Bronco 5.0
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Yo,

Hopefully that cover's gasket area is not distorted. What did the builder say after last leak with thicker gasket?

Some use Fel-Pro® PermaDryPlus gaskets, others use blue Fel-Pro®

Following by Ford;

CAUTION: Do not use solutions such as brake cleaner, carburetor cleaner, etc., as these solutions can leave a residue on the machined surfaces. Use only a cleaner which meets or exceeds Ford specification WSE-M5B392-A, such as Metal Surface Cleaner F4AZ-19A536-RA or equivalent.

NOTE: Be sure to position gasket so that chamfered edge and stamping are facing up.

Clean and inspect gasket surfaces. Inspect the gasket sealing surface for ***damage and distortion due to overtightening of the bolts***. Repair and straighten as required.*** Place the new valve cover gaskets (6584) on the cylinder head sealing surface.

Tighten valve cover attaching bolts to 12-15 lb-ft.

See these bolt tightening sequence diagrams;

http://www.diesel-dave.com/vehic/manual/stj/images/a24894a.gif

Driver side

...

http://www.diesel-dave.com/vehic/manual/stj/images/a24894a.gif

Passenger side

...

 

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