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On the rebuild sheet did they add case savers? There like timecerts that hold the head studs more securely into the block. As mentioned earlier, the 2.7 weakness was a propensity to pull the head studs from the case or to break them, particularly if they are Delvar. It's standard procedure to replace Delvar during a rebuild with steel. If the head studs were not replace and case savers not used, no way I would put any more stress on this engine. Heat cycles associated with the thermal reactors make the magnesium more brittle. Taking all that stuff off (Thermal reactor, air pump, ac (if not working)) is a great place to start.
Chris
73 E 2.4
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