Now I am curious, I have done 100 or so valve jobs on these motors and it doesnt take alot to pull the heads. I guess it comes down to the tech , Being on comission most of us will not pull the engine to do a head job , waste of time personally. But I guess if the shop quotes to pull it I would. Only reason I would pull the engine is to do the lower end. It all comes down to the job . Everyone does things differantly so go with what your tech wants to do.