Knowledgeable LT1 guys help please
Hold old is this water pump? Have you had a look at the water pump's impeller? Over time, they can rot away and move less coolant.
One thing people forget about is the air dam underneath the car. I've seen tons of "i can't figure out why my car is overheating" threads, and some of them were resolved by putting the air dam back on (because they had previously removed it).





