Sacramento Carnage

Gotcha!, pretty common, all motors I have built I used Felpros, they are all the same. I asked engine gurus and they say the same. Also all I have read are the same, Andy Finkbeiners book eludes to it as well.

As for the rust - The block\heads were brand new clean (tanked, etc...) Well I hooked it up to the heater core on and blam... Dirty Dirty Dirty... Lesson in life, flush the core