It may have a mis-adjusted valve. But it would have a pretty bad amount of lash to do so. The lash may be wrong because the push rods were not kept in order when the engine was rebuilt or they did not at least measure them when they put it back together to make sure the distance from lifter to the rocker arm was correct. The other possibility is that the lifters were not replaced or installed wrong and one of them is crushed. This can also be casued if there is a clog in the oil port on the lifter and it will not have the correct valve lash.
The place to start is to ask about the lifters and the psuh rods and have the valve lash measured.
Please consider a to help us answer more questions.
Sunday, January 15th, 2012 AT 3:26 AM