I have a 1974 mercruiser 302 with an 888 outdrive. I've been slowly getting it working. My last bit to make her seaworthy is, shes taking on water. When shes running she doesnt take on water. But when shes off she does. Upon removal of teh manifolds and risers, I found that it looks like the y-pipe/collector pipe appears to have cracked from poor winterizing. I've looked through my maintenance books and can't find any info on how to remove this. And its difficult to see how it would come out any help?