I changed out my heater core twicei n about 2 months. The 1st one I bought ended up being bad. I bought "Mustang 5.0 Projects" by Houlahan. Picked it up at Hastings. One of the best books I have bought in a while. They take you through a step by step instruction, to include what the bolt sizes are, along with pictures, on how to change out your heater core. Definately money well spent. They also go through like 15 other repairs/add-ons. Just thought I would share that incase you wanted a little better instructions than Chiltons.
Chris
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