I have a 2uz-fe engine which I have removed the right hand head. Unfortunately i didn't remove the lifters before turning it over and as a result all the lifters and shims fell out. i know how to do a valve lash but my question is. With all the lifters and shims out and no way of knowing which one came from where is the a starting point to work out the shim size for each lifter to get the correct clearance under the cam lobe??