Help on refilling coolant

Cskaggs2

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I drained block and radiator. I refilled with distilled for a flush. It took about 6 gallons. Ran it up to temp and then drained again. On 2nd refill/flush, I was only able to get 3 gallons before radiator started overflowing through upper hose entry point. I had drained block and radiator again.
Is it safe to start and let heat up? I have this worry that my block has no or little water in it. First time I have ever done this work. I did install pet ***** for the block drain plugs.
 

Clb

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Pull the return hose from the core to the top of the water pump and burp it out there.
I took a old rad cap and fashioned a garden hose fitting on it to power flush it.
Dont close the system without a drain open or you may cause issues with to much psi in the system...
 

Cskaggs2

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Thanks for the help. I think my error was trying to first fill through top into water pump. This backed up as I guess bypass path is narrow. I then switched to radiator. This trapped air in the block. I waited till the next day and the top hose had emptied. This let me finish filling through the radiator.
 

Clb

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Here's the bypass port on the right, when cold, this is the air bleed and the bypass port is nickle sized
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