Why do i need a valley pan gasket?

[Kenall]

when i pulled the intake off the 75 cuz i gotta pull the head due to lo compression in #7, i was floored to see that the intake gasket was metal and intregal with the valley pan.

y do i need the 'valley' part of this gasket?

[AMX factor]

Actually yes you do. It helps keep oil from baking onto the bottom of your intake and reeking havoc with your EGR system plus making the intake run much hotter than normal. I've seen people run without the valley gasket and use the normal Moroso gaskets and not have problems but I've seen other have problems. Definately need the oil baffel that is riveted to the bottom of the intake. It's kind of your personal call, I don't run anything else but the valley gasket.

[Stuka]

I run the valley pan. Without it you will get excess carbon deposits on the intake over time.

[Crazy_Jeepman]

I do not use the valley gasket and I never had a bit of trouble, in fact less trouble because the paper gaskets seal so much better.

[Kenall]

then i want to mount the valley part of this gasket to the block , after i cut off the intake seal part, and then use normal seperate intake gaskets.

also, can i use the SBC trick of a large bead of
silicon on the FnR ends of the block when i install the manifold, instead of using those rubber endseals??

[RustyJeep]

yes you can smile.gif

[skid2964]

If no EGR, no valley pan needed?

[Stuka]

Silicone never last. If the rubber seals are installed correctly they will last just fine. The trick is you have to clean both surfaces perfectly using acetone or enamle reducer. Alll oils MUST be removed. And after cleaning, you cannot touch these areas, the oils off your skin is enough to mess up the seal. If done right, the rubber will bond with the mtal, and if you ever pull the intake again, you will actually have to scrape the rubber off. Then just use tiny drops of silicone in the corners.

[Crazy_Jeepman]

Originally posted by Kenall:
then i want to mount the valley part of this gasket to the block , after i cut off the intake seal part, and then use normal seperate intake gaskets.

also, can i use the SBC trick of a large bead of
silicon on the FnR ends of the block when i install the manifold, instead of using those rubber endseals??The Black RTV does work well. It will last longer than the gaskets will. ;)

[Stuka]

/me still disagrees on that.

[skid2964]

If no EGR, no valley pan needed?

[Crazy_Jeepman]

GM has not used those end gaskets or valve cover gaskets for years, even T-cases and Diff Covers do not have gaskets anymore its all RTV, my 89 Burb did not have a single oil leak, or the Pontiac, and now this Lumina with 181K on it. TOSS THE RUBBER ENDS LOL. EGR or no EGR, I do not use the Vally style gasket.

[jeepsr4ever]

I dont like the valley pan gaskets for most uses, Yes if you have a EGR you NEED some type of valley pan gasket or you will suck up your oil and smoke hard! If you dont have a valleypan gasket and no egr you will be alright also sometimes you may need to do something with the PCV valve if you are running a dropped crossmember. For what we are doing the heat on the manifold doesnt really matter since the manifold gets that hot anyways

[Kenall]

thanks

[porkchop]

I don't like them myself. I bought some performance gaskets and used them on the Rhino. No need for the valley gasket. Plus they are easier to put in :D .