Lifter Clatter

Some hydraulic rollers and solid rollers use the same lobes, but not all of them are that way. That being the case you must run very tight lash when installing solid lifters on a hydraulic cam. It gets even more touchy if you have aluminum heads, because, the lash setting is about the same as the aluminum head will expand. I run solid lifters on hydraulic cams and use .005"-.006" cold lash on iron heads and .000"-.002" cold lash on aluminum heads. The aluminum heads will expand and increase the lash about .006" to .006"-.008" lash total. I don't like any more lash on a hydraulic cam because of the ramp opening design.