I never had to turn the engine over to install them. As a matter of fact 35 years ago I installed a Mopar 695 lift mushroom tappet with the engine in the car. I made up a rounded U-shaped piece of thin aluminium and slid it in the cam tunnel. Them starting with the rear lifters I slid them to the rear of the block and fished then up into the lifter bores with my fingers and a small screwdriver. As I got each one up in the bore I held them up into place with my Mothers cloth pins, slid the cam in, and removed the cloth pins. My 69 dart ran 10.20's with that cam, stock cam and rods, and 906 heads back when 10.20's were pretty dog-gone quick. Pretty cheap way to go fast.