Ive got a leak at the rear of my valve cover gasket. I have a new gasket set from fel-pro. My question is the new feel-pro gasket set has 2 half moon gaskets, one is marked 38 & one is marked 41. 38 has thinner rubber than the other around the sealing edges, are they different for the front and back, if so which one goes where. Thanks

 

wow, I haven't heard of that. Just got a Felpro set a few weeks back...didn't look closely at them. I popped whichever one in each slot. Have had no leaking whatsoever - but that doesn't mean I didn't just get lucky! Maybe a guru's got an answer that will settle it.....?
Man, I'd call FelPro tomorrow morning if you don't hear on this forum...sounds weird to me!
My .02....

 

weird? never heard of that either..did the same thing just slipped em in..if you had a carb ide say just slap em n there and if they leak switch em around...but thats a diff story on the 22re..use some black RTV on them half moons as well..