hi everybody,i have heads on, belts on, and everything looks good there.when i took the heads off i loosened all the tension screws.when i have the engine at t.d.c and adjust #1, #2 is loose at the same time. but #3 intake and #4 exhaust are tight.when i go around again at t.b.c #3in and #4 ex. are loose.but when it gets back to t.d.c. #1 & #2 are loose at the same time again.what am i doing wrong? i hope i explained this o.k.