Hello,
I had a cracked reservoir and the replacement arrived today. I've more or less been adding only water the last couple of months.
As the car has 105,000 miles, I plan to go ahead and drain all coolant and replace with fresh.
Does the open petcock drain all the fluid out? (5 quarts I understand).
Or is there block drain plug(s) to get all the fluid out of the block?
I recall on my SBC's the petcock would only drain 50% (2 gallons). To get the remain 2 gallons out you'd have to remove 2 knock sensors that would drain an additio