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The reason for adjusting these HOT on the flathead sixes is to avoid the vagaries. Since the wear on the valve stem and the tappet screw will affect the accuracy of a cold reading, adjusting them hot with everything grown to its operating conditions makes for a more accurate adjustment. In these...

Just a rule of thumb about valve adjustments. Loose is good for idle and low speed operation at the expense of high rpm performance. Tighter is better for high rpm performance at the expense of low RPM torque and idle. Since these 230's aren't exactly high revving, the wider gaps work well.

I adjusted each valve with the tappet on the heel of its cam lobe. Since it is on a stand and out of the truck, you can more easily see it as you rotate the engine.