The SBC in my '56 leaked pretty bad at first. Come to find out the Weiand intake manifold was keeping my valve covers from setting flush. Some creative carving of the valve covers fixed the problem.
Ed
I have a Weiand intake also and I had the same problem. I had to grind off part of the lip on my valve covers. I don't think that's the problem though, because it's leaked this way with two different sets of valve covers.
I can't for the life of me see the leak! I checked with a flashlight from the top and from the bottom, every angle I can get at. I know there is a leak though because every time I start it up the drivers side manifold smokes like crazy for about 10 minutes and there is oil on the top of the lip of the valve cover. So somehow it is getting past the gasket and up over the lip onto the valve cover, or it is leaking out of the bolt hole. This is driving me nuts.
