radiator & block water capacity & crank rotation

[Reckless Rat]

There is a very high risk that one or both of the bolts locating the side water branch to the block are seriously corroded and may snap off when you try to remove them. In addition the very small cast iron web across the branch connection may also be badly corroded. It can be repaired with a custom repair
but as I stated earlier remove it at your peril. Don't say you weren't warned! See www.ba7.org technical articles on how to rectify.