Hey fellas, I as working on my 400 the other day installing a new adjustable vac advance. I put everything back together plug wires etc. I then tried to start the car and it wouldn't fire up. I kept trying to get it to fire for about 10 seconds at a time. Finally I rechecked my plug wires and everything checked out. I then attempted to start the car when a huge single backfire almost took my hearing out....then the car started as normal. What could cause this????Incorrect valve settings???fuel from trying to start the car???
today when I removed the valve cover on the driver side when I noticed my #7 rockers were off the spring and the pushrods were nowwhere to be found. I took off my roller rockers and guideplates and looked into the lifter valley. I found my lifters and pushrods still intact but they were out of there sockets. I put the lifters back in there sockets and pushed down on them with a pushrod to see if the still had spring (hydraulic) one did not which I think is bad Correct? So my question is.....Did the backfiring cause this situation with the #7 cylinder and lifters? Is that hydraulic lifter bad if there is no spring in it? Any help would be appreciated.