I have done it both ways more than once and i much prefer to pull engine UNLESS it has a shit load extra aftermarket gauges, cooler etc etc. I guess you guys want to do everything yourselves to save money and that's ok, but if im gonna put my name on the work i do on your pride and joy as a paying customer, then it gets done my way. How do you go checking the lines on the back around the head? sure would hate to take someones money and have them come back in a week because of a water leak that you missed because you took a short cut