Engine really knocks after leakdown

Agree with OldmanRick. Backward movement of engine by hand should not harm.... Faulty - Weak lifters drained....after yourleak down. Check your oil level. Flash up the engine tell she warms up or to the sound of your orginal engine sound. Lifters should refill and be stiff. Turn off, and do a lifter check to see how fast they empty by doing a push test between the valve and the rocker using a screw-driver.