Took the 49 3800 on the road

Have no idea how long since it’s been on the road

New radiator

Drove 6 miles

Filled with gas

3 miles from home on the return trip stsrted blowing coolant out overflow steam

Jim Carter rebuilt temp gauge never went over 180

In fact didn’t go over 180 when I shut it off

Haven’t tested rad cap yet

Any thoughts

Thanks