I just went thru the priming process a couple of weeks ago for my SBC that had been sitting for 21+ years. It took a LONG time of spinning the oil pump before I got oil coming out of the pushrods. It took about 15 minutes before I started to get oil out of the pushrods on the driver's side and another 10 minutes or so before I got oil on the passenger side. I don't think 3 minutes is anywhere near long enough to pump up the lifters, etc. Just my 2 cents. Good luck!