I designed a tool for splitting the case halves. I have not completed it yet, but when I do, I will make a few of them and offer them to those who may want them.
Here is the original post I made about it last year:
Team Scream Case Splitter
And here is a drawing I sketched up in Illustrator to show the concept.
I will be diving into this tool to try and complete it as soon as I get these 2 engines built.
The concept is to use the crank as a fulcrum, a used set of head bolts as the pulling agents, and tooling that bolts to the flywheel contacts @ the back of the crank, and uses a rubber pad between the tooling and the front of the crank.
Essentially, the used head bolts will separate the case halves from the dowels and sealant by keeping the crankshaft stationary.
This is a rough sketch of what it looks like so far, but if you visualize it, you will get the picture pretty easily.
No pounding on the case, no prying, no damage the the mating surfaces or dowel pins from cocking the case halves. Just clean, perfect separation which is what you want when you want to inspect main bearings and impart no additional scoring or damage during the case splitting process.