[Woodz428]

I've got about a dozen Cleveland blocks, have had Clevelands since the early 70s, and I have never seen one of those out. It doesn't just fall out accidently, someone had to intentionally remove it for some reason. If you don't locate one I can probably knock one out and give you the dimensions. I believe they have a small lip under them that presses into the block, in the U.S. I don't believe they are serviced seperately. You may have better luck down under since they are still a "current" engine in comparison to here.