This seems like it should be a no-brainer... which way does this valve go? It has a "to head" arrow on it, but it doesn't mount on the head, it mounts to the block. It's #18 on this diagram:
http://shop2.evinrude.com/ext/index.aspx?s1=c15ee610fd13ef9fcaff1587ae1f0f4d
http://shop2.evinrude.com/ext/index.aspx?s1=c15ee610fd13ef9fcaff1587ae1f0f4d