I ran my 20B at idle, till about 160 degrees. My water pressure rose up to 23 lbs. That seems excessive to me, but I've never watched water pressure before. I've bled the block a couple of times and I dont feel like I have an air lock. Heat is even throughout the radiator. I was a bit worried about compression leaking into the cooling chamber, but I'm not loosing any water, the plugs aren't wet, and it starts flawlessly each time. Hot or cold. Recon I'm all worried about nothing?

 

Bob Mears

Supermarine Spitfire