Cold lash is always tighter. Aluminum heads require tighter cold lash than iron heads. Aluminum heads and block should be lashed .015-.018 tighter cold. Then checked hot and adjusted as required.
I dont agree, my lash is only .016 and .018 hot ! A lifelong mech. and machinist, engine builder friend told me , 006 titer lash "cold" on alum. heads .
I read that toyota said the same thing -----------------thats the way I`ve been doing it for about 10 yrs now .
I f someone followed ur advise on alum. heads ,w/ a titelash cam , they`d lose it for sure !