Valve Cover Gaskets for Fabbed Aluminum

[streetdak]

Now that I've gotten a few miles on the car, I still seem to have a valve cover leak. Thanks to the great new technology of smart phones, I confirmed it! Question is now, whats a good gasket to use on these valve covers that seal well? I going to tighten them up a bit more to see if it remedys the problem, but was wondering if anyone else on here has had luck with other gaskets?

BTW im using some fel-pro hard black rubber gaskets from a 85 dodge 318 truck if that helps. Oh and FYI, seems to be bad when 3/4-full throttle, otherwise, dosn't leak

 

[Bad Sport]

Oh and FYI, seems to be bad when 3/4-full throttle, otherwise, dosn't leak

This made me look for ventilation, do you have and crankcase ventilation? I don't see a PCV or a breather cap.

Just a thought.

 

[streetdak]

This made me look for ventilation, do you have and crankcase ventilation? I don't see a PCV or a breather cap.

Just a thought.

Yeah, I though of that too, but that chrome circle on the pass side is a breather, so It does have one. It could be leaking at lower rpm's, its just not as noticeable, maybe a PCV is the way to go

 

[mopardude318]

mopar performance blue rubber gaskets with steel core...

 

[OldVart]

You're getting air into the engine, now you need a PCV valve to help get the combustion gasses out.

 

[mikedevore]

I have the same valve covers on my racecar. I have the Fel-Pro 5/16 thick gaskets to help clear the intake runners. I used black silicone to glue them to the covers & let it set up.
They have been on the engine for three years.
I check valve clearance about three times a year.
No leaks yet, I run an open breather in both valve covers.

 

[73Scamp318]

I've had good luck with the Fel-Pro 1609 cork/rubber gaskets. Just about any auto parts store should carry them and they have always sealed well for me.

The hard, black gaskets almost always seem to leak on me.

 

[mjs69gts]

ive heard the moroso vc gaskets with the steel in them are a good choice also when my felpros start to leek i will change to the morosos

 

[pntastar69]

I always apply a bead of permatex to both sides of the gaskets, even the stock Fel-Pros.

 

[jefflock]

mopar performance blue rubber gaskets with steel core...

I use these also. No leaks.