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Have you tried a can of block sealer?? Try it it cant hurt. I am having this same problem with a olds 330 v8 that a friend of mine had built for his father in law. I think that when the valve job was done and they installed news seals that it was drilled out very very close to the water passage. When they pressure test they dont leak but when the piston is more less sucking when on a down stroke it is pulling a small amount of water in at a time. Just my theory though!!
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92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448
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