Re: 5.5 head
Rebuilders recommend changing out the studs on a rebuilt engine. The latest ones I bought were not straight and it made putting the head on difficult. However, after a few miles and a few re torquing, they straightened out so the head was easy to remove next time. The straightening indicates to me that there is some yielding in the steel. If you do change out the studs make sure the tapped holes in the block are clean down to the bottom. I use some anti seize except if the holes go into the water jacket, in which case I will use a sealant.
The high compression heads are more efficient so more of the fuel is converted to torque and less to heat. So, if you drive your car at the same speed as before the coolant temperature will be lower.
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