Rubber or cork?

[HemiPar]

Hey all. I will be putting an Offy valve cover on my ride soon and wonder what would be the best choice for the gasket? It's a 225 btw.

 

[jw133489]

Rubber.

 

[plum crazy dart]

X's 2, just did that.

 

[lowbudget]

Rubber.

X3 I also glue mine to the valve cover so it comes off with it.

 

[Mr.FT]

X4 Rubber

 

[68383GTS]

I like cork myself.

 

[BillGrissom]

Both rubber and cork leak for me. If a stiff cast aluminum valve cover and a flat, machined head surface, a silicone gasket is best, but I don't recall seeing those for a slant (RB & BB) and most of these old head designs have a rough sealing surface which is one of the reasons they leak. Next time I have a head at the shop, I'll try to have them mill a flat gasket surface.

 

[Bulldozer]

i use both. not one of them leaks. i put them on dry

 

[Charrlie_S]

Reusable silicone.
http://www.realgaskets.com/files/automobile.htm
MVC-3

 

[HemiPar]

Thanks for all the replies. Now need to finish the install of PCV in valve cover then install.

 

[ESP47]

I use rubber and coat it in vaseline. That way the valve cover comes off without ripping the gasket when I need to do a valve adjustment.

 

[66durgederp]

rubber if you can get it to stay in place, they like to pinch out much easier than cork. myself, i really dont care as long as it doesnt leak, but if i can do it without paying a left kidney, i go rubber.