Sorry to hear about your troubles. This story is eerily similar to mine. Old build with factory rods, crank, TRW slugs, etc. Decided to upgrade to AL heads. Twenty year old cam wipes a lobe a week before I was going to install heads.. New flat tappet cam wipes a lobe on break-in. Upgrade to roller cam...block cracks in #7 cylinder wall.... Not to mention tearing it down to the bare block twice to clean out the trash between failures. That's why there's a $400 5.3 between my frame rails now. Best of luck to you!
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