Of course you can adjust the valves on a cold engine and you must before starting it. You will find that the lash changes very little between cold and hot. The in between period though will have a varying lash.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!