My question is: do I need to warm up my engine before checking and or adjusting my valve lash on a hydraulic flat tappet cam? I have read both cold and warm are O.K. due to the hydraulic compensation that exists with non-solid lifters.

A quick response / comments would be appreciated, as I have some time this evening to do the job.

No, once you get it to idle down, it should be fine to set the plunger depth.

<font face="Arial,Verdana" size="2">Originally posted by camdoc:
No, once you get it to idle down, it should be fine to set the plunger depth. </font>
I'm assuming you mean once the cam has been broken in and the car has a few miles on it, then it is O.K. to do them either warm or cold??
I originally set the valve lash on the engine stand during the motor build. Once in the car, I fired her up and did the cam break-in. Since then I have put probably 30 miles on it and have had it running in the garage to set timing, carb, etc.