you just need to bleed out the air (burp it). What i did was jacked up the front end (pretty high but not to high), open the bleeder bolt (on top of manifold by coolant hose) and than just filled it up till it came out the bleeded bolt. close the bleeder and turn on the motor than droped it and filled it up to the top if needed. Thats what i did 2 different times and it worked out great. hope that helps. I know theres a couple of different ways to do it but this just work for me.