Thread: My Rat Build

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Originally Posted by Louey

If you didn't see any steam, prior to that, sounds like you didn't have enough water in the block, and probably got a good air lock, I call it.

You called it exactly right.

After removing the thermostat today I found the block had very little water in it even though I had tried to fill it during the first running of this engine after rebuild. My guess it pushed out more water than I realized on the first attempt and the second time I ran it I had the cap on tight being the radiator took very little water and it trapped air inside the block causing the pressure to build till something had to give in which it was the hose.

I filled the block before reinstalling the thermostat today (2 gallons) and filled the radiator and cranked the engine. I ran it for a good 30 minutes or so at 190 degrees and it ran perfectly with no over heating problems.

Thanks to those who replied to my post and for the help I recieved.

Larry