No need to do this unnecessary work. The RUST 911 will dissolve all the rust in the block, head, and flakes in the radiator. No need to take the time and expense of pulling the head to do a poorer job of removing rust.
One bottle of Rust 911 will leave your cooling system totally rust free and you will have lots left over to de-rust other things.
https://www.amazon.com/Rust911-16-ga...s%2C233&sr=8-2