In the process of restoring my 29 d but the radiator thing puzzles me. online I see it holds 12 gallons or so and they talk about air pockets and such. After flushing clean water through it a few times it appears water was still inside the block because I could only get 8 gallons of antifreeze in with a couple inches left at top of radiator for expansion. It was a 50/50 premix and after asking ai why it is only good to neg. 10 degrees {after running the engine for five minutes to mix and coolng overnite} they said it would take 2.3 gallons of water to bring it up to that temp. That is still only 10.3 gallons total. Any help on this woul be appreciated.