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Ryan, You may want to do a combustion leak test to confirm that it is combustion gasses that are making the pressure. Balkamp makes a test kit that will show if combustion gasses are present in the cooling system. It will help you narrow things down in a situation like this. The part number of the test kit is 700-1006 and should be available at any NAPA store. It is an inexpensive tool and it is a simple test to perform. I have found it to be very accurate and a great time saver. You did not mention if you used OEM or aftermarket parts in the rebuild. I sometimes wonder about the QC standards used by some of the aftermarket suppliers, and I always check aftermarket parts over very carefully before I use them. Did you check things like liner protrusion carefully? Was the deck and head checked for straightness? If you determine it is the head, look into an OEM Cat reman. I have had good luck with their parts, and for a while, they were seeding their reman head program with brand new castings. We were getting brand new heads at reman prices. Another site to check is www.acmoc.org A great Cat site with tons of info. Good Luck!
Scott
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