You had an extraordinary, rare aluminum Pontiac block and a guy with skills to match working on it. Guys like that are dying off fast and there will no one to replace them. That sealer I bet was a ceramic slurry run through the block under some pressure. I had a few blocks and several leaky Edelbrock heads fixed that way. Cost becomes no object when trying to save a piece of history. I put 8 sleeves in and had 3-4 major water cracks repaired on a numbers matching lightweight hemi car. Same deal, save the engine, cost no object.
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