Blown head gaskets at water passages

I just got done tearing my motor down because I sure I had a blown head gasket. It turns out that both of them were blown. Three of the upper water passages were blown out on each cylinder head. I knew i was pressurizing my coolant system but didnt know how bad. I got fel-pro 1011-1 head gaskets and ARP head bolts. What I would like to know is if there are any other ways that I could be pressurizing the coolant system. I have a set of rebuilt E7TE heads that have about 1000 miles on them going back on. I will be using Fel-pro gaskets for the intake also. On a good note I can still see the cross- hatch pattern on all the cylinders even though the motor has over 100,000 miles on it. I guess frequent oil changes really do work, any how I may do the cam, lifters and timing chain since the timing chain gasket blew also and the bottom end looks good. If anyone has any advice as to how to avoid this same senario with the coolant system that would be great.

86bluecobra said:

a question about your initial install. you torque your head bolts befor you installed your intake didn't you?
I was also under the impression that you should re torque head bolts after your engine has run for a couple hundred miles. 1 more thing were you re using old head bolts or where they fresh?

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The heads were still my factory stock heads and have never been off the car till now. I changed the intake about 3 years ago. I would like feed back on if it is neccassary to retourqe head bolts. I mean what if you buy a crate motor or long block. I havent heard about any one having to retourqe anything on them.