[truckin 79]

I have learned a lot reading your post thread thanks a lot. You will find the new heater cores are aluminum and are smaller than the original. At least the heater core I got from Advance auto was like that. I luckily had some extra foam lying around that I stuffed on the sides of the heater core. Also make sure they give you the right heater core as the first time they gave me a H core for a AC truck. I hope you didnt ruin the bolts that bolt on from engine bay, those are a bear to find.