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Mike I had an old 427 tall deck block that I ran blown alky for a few seasons, ya need to stud that thing NOW, just FYI, I probably had 7 or 8 helicoils in that thing by the time I chunked it. It was filled and the heads were solid castings so water was not an issue. Stud it, you'll be fine. Stud the mains while yer in there too. 8) JB